<?xml version="1.0" encoding="utf-8"?>
<InstanceReport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Version>1.0.0.3</Version>
  <hasSegments>false</hasSegments>
  <ReportName>Acquisitions</ReportName>
  <RoundingOption />
  <Columns>
    <Column>
      <LabelColumn>false</LabelColumn>
      <Id>1</Id>
      <Labels>
        <Label Id="1" Label="12 Months Ended" />
        <Label Id="2" Label="Dec. 31, 2009" />
        <Label Id="4" Label="USD / shares" />
      </Labels>
      <CurrencySymbol>$</CurrencySymbol>
      <hasSegments>false</hasSegments>
      <hasScenarios>false</hasScenarios>
      <Segments />
      <Scenarios />
      <Units>
        <Unit>
          <UnitID>Shares</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>USD</UnitID>
          <UnitType>Standard</UnitType>
          <StandardMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </StandardMeasure>
          <Scale>0</Scale>
        </Unit>
        <Unit>
          <UnitID>USDEPS</UnitID>
          <UnitType>Divide</UnitType>
          <NumeratorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema>
            <MeasureValue>USD</MeasureValue>
            <MeasureNamespace>iso4217</MeasureNamespace>
          </NumeratorMeasure>
          <DenominatorMeasure>
            <MeasureSchema>http://www.xbrl.org/2003/instance</MeasureSchema>
            <MeasureValue>shares</MeasureValue>
            <MeasureNamespace>xbrli</MeasureNamespace>
          </DenominatorMeasure>
          <Scale>0</Scale>
        </Unit>
      </Units>
    </Column>
  </Columns>
  <Rows>
    <Row>
      <Id>2</Id>
      <Label>Acquisitions [Abstract]</Label>
      <Level>0</Level>
      <ElementName>wat_AcquisitionsAbstract</ElementName>
      <ElementPrefix>wat</ElementPrefix>
      <IsBaseElement>false</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ElementDataType>string</ElementDataType>
      <ShortDefinition>Acquisitions [Abstract]</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>true</IsAbstractGroupTitle>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsEPS>false</IsEPS>
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText />
          <NonNumericTextHeader />
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
        </Cell>
      </Cells>
      <ElementDefenition>Acquisitions [Abstract]</ElementDefenition>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
    <Row>
      <Id>3</Id>
      <Label>Acquisitions</Label>
      <Level>1</Level>
      <ElementName>us-gaap_BusinessCombinationDisclosureTextBlock</ElementName>
      <ElementPrefix>us-gaap</ElementPrefix>
      <IsBaseElement>true</IsBaseElement>
      <BalanceType>na</BalanceType>
      <PeriodType>duration</PeriodType>
      <ElementDataType>string</ElementDataType>
      <ShortDefinition>No definition available.</ShortDefinition>
      <IsReportTitle>false</IsReportTitle>
      <IsSegmentTitle>false</IsSegmentTitle>
      <IsSubReportEnd>false</IsSubReportEnd>
      <IsCalendarTitle>false</IsCalendarTitle>
      <IsTuple>false</IsTuple>
      <IsAbstractGroupTitle>false</IsAbstractGroupTitle>
      <IsBeginningBalance>false</IsBeginningBalance>
      <IsEndingBalance>false</IsEndingBalance>
      <IsEPS>false</IsEPS>
      <Cells>
        <Cell>
          <Id>1</Id>
          <ShowCurrencySymbol>false</ShowCurrencySymbol>
          <IsNumeric>false</IsNumeric>
          <NumericAmount>0</NumericAmount>
          <RoundedNumericAmount>0</RoundedNumericAmount>
          <NonNumbericText>&lt;div&gt;&lt;!-- 2.0.3575.42229 --&gt;&lt;div&gt;&lt;!-- body --&gt;&lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-autospace: none;"&gt;&lt;a name="_AUC819ecf4ed1914cb38cd5df2d3ea5f5dc"&gt;&lt;b&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;6&amp;nbsp;&amp;nbsp;Acquisitions&lt;/font&gt;&lt;/b&gt;&lt;/a&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;Effective January&amp;nbsp;1, 2009, the Company implemented the newly issued accounting standard for business combinations. This standard requires an acquiring company to measure all assets acquired and liabilities assumed, including contingent considerations and all contractual contingencies, at fair value as of the acquisition date. In addition, an acquiring company is required to capitalize IPR&amp;amp;D and either amortize it over the life of the product or write it off if the project is abandoned or impaired. This accounting standard is applicable to acquisitions completed after January&amp;nbsp;1, 2009. Previous standards generally required post-acquisition adjustments related to business combination deferred tax asset valuation allowances and liabilities for uncertain tax positions to be recorded as an increase or decrease to goodwill. This new accounting standard does not permit this accounting and generally requires any such changes to be recorded in current period income tax expense. Thus, all changes to valuation allowances and liabilities for uncertain tax positions established in acquisition accounting, whether the business combination was accounted for under previous standards or under the newly issued accounting standard, will be recognized in current period income tax expense.&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-indent: 9.0pt; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;In &lt;font style="color: black;" class="_mt"&gt;February 2009, the Company acquired all of the remaining outstanding capital stock of Thar Instruments, Inc. (&amp;#8220;Thar&amp;#8221;), a privately-held global leader in the design, development and manufacture of analytical and preparative supercritical fluid chromatography and supercritical fluid extraction (&amp;#8220;SFC&amp;#8221;) systems, for $36 million in cash, including the assumption of $4 million of debt. Thar was acquired to add its environmentally-friendly SFC technology to the Company&amp;#8217;s product line and to leverage the Company&amp;#8217;s distribution channels. The Company had previously made a $4 million equity investment in Thar in June 2007. Immediately prior to the acquisition date, the Company remeasured the fair value of its original equity investment in Thar, resulting in an acquisition date fair value of $4 million. Thus, there was no gain or loss recognized in the statement of operations as a result of remeasuring the Company&amp;#8217;s equity interest in Thar to fair value prior to the business combination.&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-indent: 9.0pt; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;The acquisition of Thar was accounted for under the newly issued accounting standard for business combinations and the results of Thar have been included in the consolidated results of the Company from the acquisition date. The purchase price of the acquisition was allocated to tangible and intangible assets and assumed liabilities based on their estimated fair values. The Company has allocated $&lt;font style="color: black;" class="_mt"&gt;24 million of the purchase price to intangible assets comprised of customer relationships, non-compete agreements, acquired technology, IPR&amp;amp;D and other purchased intangibles. The Company is amortizing the customer relationships and acquired technology over 15 years. The non-compete agreements and other purchased intangibles are being amortized over five years. These intangible assets are being amortized over a weighted-average period of 13&amp;nbsp;years. Included in intangible assets is a trademark in the amount of $4&amp;nbsp;million, which has been assigned an indefinite life. Also included in intangible assets are IPR&amp;amp;D intangibles in the amount of $1 million, which will be amortized over an estimated useful life of 15 years once the projects have been completed and commercialized. The excess purchase price of $22 million has been accounted for as goodwill. The sellers also have provided the Company with customary representations, warranties and indemnification, which would be settled in the future if and when the contractual representation or warranty condition occurs. The goodwill is not deductible for tax purposes. Since the &lt;font style="color: black;" class="_mt"&gt;acquisition date, Thar added $17 million of sales to the consolidated statements of operations for the year ended December 31, 2009. Thar&amp;#8217;s impact on the Company&amp;#8217;s net income since the acquisition date for the year ended December 31, 2009 was not significant.&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-indent: 9.0pt; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; color: black;" class="_mt"&gt;In accordance with the accounting standards for fair value measurements and disclosures, the Company measured the non-financial assets and non-financial liabilities that were acquired through the acquisition of Thar at fair value. The fair value of these non-financial assets and non-financial liabilities were determined using Level 3 inputs. &lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;The following table presents the fair values, as determined by the Company, of 100% of the assets and liabilities owned and recorded in connection with the Thar acquisition (in thousands): &lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-indent: 11.0pt; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;b&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/b&gt;&lt;/font&gt;&lt;/p&gt; &lt;table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" style="font-size: 10.0pt; font-family: 'Times New Roman'; margin-left: 2.35pt; border-collapse: separate;"&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Cash&lt;font class="_mt"&gt;..................................................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;$&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; 364&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Accounts receivable&lt;font class="_mt"&gt;.......................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; 3,863&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Inventory&lt;font class="_mt"&gt;..........................................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; 3,508&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Other assets&lt;font class="_mt"&gt;......................................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; 4,421&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Goodwill&lt;font class="_mt"&gt;...........................................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160; 22,382&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Intangible assets&lt;font class="_mt"&gt;..............................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;u&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160; 23,500&lt;/font&gt;&lt;/font&gt;&lt;/u&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr style="height: 4.0pt;"&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; height: 4.0pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 0in; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&amp;nbsp;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; height: 4.0pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&amp;nbsp;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="top" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 93%;" class="_mt"&gt;Total assets acquired&lt;font class="_mt"&gt;........................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="top" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;u&gt;&lt;font style="font-size: 10.0pt; line-height: 93%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160; 58,038&lt;/font&gt;&lt;/font&gt;&lt;/u&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="top" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&amp;nbsp;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="top" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&amp;nbsp;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Accrued expenses and other current liabilities&lt;font class="_mt"&gt;..........................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; 5,499&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Debt&lt;font class="_mt"&gt;...................................................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; 3,899&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;Deferred tax liability&lt;font class="_mt"&gt;......................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;u&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;&lt;font class="_mt"&gt;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; 8,658&lt;/font&gt;&lt;/font&gt;&lt;/u&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 0in; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&amp;nbsp;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&amp;nbsp;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td width="705" valign="bottom" style="width: 423.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 0in; margin-right: 5.05pt; margin-left: 5.05pt; text-indent: -5.05pt; line-height: 93%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt; line-height: 93%;" class="_mt"&gt;Cash consideration paid&lt;font class="_mt"&gt;................................................................................................................................&lt;/font&gt;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;td width="75" valign="bottom" style="width: 45.0pt; padding: 0in 2.35pt 0in 2.35pt; border-top: 0px;"&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: 1.0pt; font-size: 12.0pt; font-family: 'Times New Roman'; margin-top: 1.0pt; margin-right: 0in; margin-left: 0in; line-height: 94%; text-autospace: none; white-space: nowrap;"&gt;&lt;font class="_mt"&gt;&lt;u style="text-underline: double;"&gt;&lt;font style="font-size: 10.0pt; line-height: 94%;" class="_mt"&gt;$&lt;font class="_mt"&gt;&amp;#160; 39,982&lt;/font&gt;&lt;/font&gt;&lt;/u&gt;&lt;/font&gt;&lt;/p&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;In December 2008, the Company acquired the net assets of Analytical Products Group, Inc. (&amp;#8220;APG&amp;#8221;), a provider of environmental testing products for quality control and proficiency testing used in environmental laboratories, for $5 million in cash. This acquisition was accounted for under the purchase method of accounting and the results of APG have been included in the consolidated results of the Company from the acquisition date. The purchase price of the acquisition was allocated to tangible and intangible assets and assumed liabilities based on their estimated fair values. The Company has allocated $3 million of the purchase price to intangible assets comprised of non-compete agreements, acquired technology, customer relationships and tradename. These intangible assets are being amortized over a weighted-average period of ten years. The excess purchase price of $1 million after this allocation has been accounted for as goodwill. The goodwill is deductible for tax purposes.&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;In July 2008, the Company acquired the net assets of VTI Corporation (&amp;#8220;VTI&amp;#8221;), a manufacturer of sorption analysis and thermogravimetric analysis instruments, for $3 million in cash. This acquisition was accounted for under the purchase method of accounting and the results of VTI have been included in the consolidated results of the Company from the acquisition date. The purchase price of the acquisition was allocated to tangible and intangible assets and assumed liabilities based on their estimated fair values. The Company has allocated $1 million of the purchase price to intangible assets comprised of a non-compete agreement and acquired technology. These intangible assets are being amortized over a weighted-average period of nine years. The excess purchase price of $2 million after this allocation has been accounted for as goodwill. The goodwill is deductible for tax purposes.&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;In October 2007, the Company acquired certain net assets and customer lists from a South Korean distributor of thermal analysis products for a total of $2&amp;nbsp;million in cash. This acquisition was accounted for under the purchase method of accounting and the results of operations have been included in the consolidated results of the Company from the acquisition date.&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;In August 2007, the Company acquired all of the outstanding capital stock of Calorimetry Sciences Corporation (&amp;#8220;CSC&amp;#8221;), a privately-held company that designs, develops and manufactures highly sensitive calorimeters, for $7 million in cash, including the assumption of $1 million of liabilities. This acquisition was accounted for under the purchase method of accounting and the results of operations of CSC have been included in the consolidated results of the Company from the acquisition date.&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;&amp;nbsp;&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;p class="MsoNormal" style="margin: 0in; margin-bottom: .0001pt; font-size: 12.0pt; font-family: 'Times New Roman'; text-align: justify; text-autospace: none;"&gt;&lt;font class="_mt"&gt;&lt;font style="font-size: 10.0pt;" class="_mt"&gt;The pro forma effect of the ongoing operations for Waters, Thar, APG, VTI, CSC and other acquisitions as though these acquisitions had occurred at the beginning of the periods covered by this report is immaterial.&lt;/font&gt;&lt;/font&gt;&lt;/p&gt; &lt;!--EndFragment--&gt;&lt;!-- body --&gt;&lt;/div&gt;&lt;/div&gt;</NonNumbericText>
          <NonNumericTextHeader>6&amp;nbsp;&amp;nbsp;Acquisitions &amp;nbsp; Effective January&amp;nbsp;1, 2009, the Company implemented the newly issued accounting standard for business combinations. This</NonNumericTextHeader>
          <FootnoteIndexer />
          <hasSegments>false</hasSegments>
          <hasScenarios>false</hasScenarios>
        </Cell>
      </Cells>
      <ElementDefenition>No definition available.</ElementDefenition>
      <ElementReferences>No authoritative reference available.</ElementReferences>
      <IsTotalLabel>false</IsTotalLabel>
    </Row>
  </Rows>
  <Footnotes />
  <ComparabilityReport>false</ComparabilityReport>
  <NumberOfCols>1</NumberOfCols>
  <NumberOfRows>2</NumberOfRows>
  <HasScenarios>false</HasScenarios>
  <MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel>
  <SharesRoundingLevel>UnKnown</SharesRoundingLevel>
  <PerShareRoundingLevel>UnKnown</PerShareRoundingLevel>
  <HasPureData>false</HasPureData>
  <SharesShouldBeRounded>true</SharesShouldBeRounded>
</InstanceReport>
