<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>009 - Disclosure - INVENTORIES - NET</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

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</LabelSeparator><Level>2</Level><ElementName>us-gaap_InventoryDisclosureTextBlock</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="Context_6ME__30-Jun-2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;table style="font: 10pt/normal times new roman, times, serif; width: 100%; margin-top: 10pt; margin-bottom: 0px; font-size-adjust: none; font-stretch: normal;" cellspacing="0" cellpadding="0"&gt;
&lt;tr style="vertical-align: top;"&gt;
&lt;td style="width: 0%;"&gt;&lt;/td&gt;
&lt;td style="width: 4%; text-align: left;"&gt;&lt;a name="lucida021_v1"&gt;&lt;/a&gt;&lt;font style="font-size: 10pt;"&gt;&lt;b&gt;4.&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
&lt;td&gt;&lt;font style="font-size: 10pt;"&gt;&lt;b&gt;INVENTORIES - NET&lt;/b&gt;&lt;/font&gt;&lt;/td&gt;
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&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 0px; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;&amp;#160;&lt;/font&gt;&lt;/p&gt;
&lt;div style="font: 10pt/normal times new roman, times, serif; margin: 0px 0px 10pt; font-size-adjust: none; font-stretch: normal;"&gt;&lt;font style="font-size: 10pt;"&gt;The components of inventories are as follows at:&lt;/font&gt;&lt;/div&gt;
&lt;table align="center" style="font: 10pt/normal times new roman, times, serif; width: 70%; border-collapse: collapse; font-size-adjust: none; font-stretch: normal;" cellspacing="0" cellpadding="0"&gt;
&lt;tr style="vertical-align: bottom;"&gt;
&lt;td style="text-align: center; font-weight: bold;" nowrap="nowrap"&gt;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;" nowrap="nowrap"&gt;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2" nowrap="nowrap"&gt;June 30, 2013&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;" nowrap="nowrap"&gt;&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;" nowrap="nowrap"&gt;&lt;/td&gt;
&lt;td style="text-align: center; font-weight: bold; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;" colspan="2" nowrap="nowrap"&gt;December 31, 2012&lt;/td&gt;
&lt;td style="padding-bottom: 1pt; font-weight: bold;" nowrap="nowrap"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="width: 42%; text-align: left; text-indent: -11pt; padding-left: 11pt;"&gt;Raw materials&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;506,174&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&lt;/td&gt;
&lt;td style="width: 3%;"&gt;&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;$&lt;/td&gt;
&lt;td style="width: 9%; text-align: right;"&gt;659,149&lt;/td&gt;
&lt;td style="width: 1%; text-align: left;"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: white;"&gt;
&lt;td style="text-align: left; text-indent: -11pt; padding-left: 11pt;"&gt;Finished goods&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;217,030&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;334,026&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="text-align: left; text-indent: -11pt; padding-left: 11pt;"&gt;Offsite demo equipment&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;96,566&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;td style="text-align: right;"&gt;96,566&lt;/td&gt;
&lt;td style="text-align: left;"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: white;"&gt;
&lt;td style="text-align: left; text-indent: -11pt; padding-bottom: 1pt; padding-left: 11pt;"&gt;Less inventory reserve&lt;/td&gt;
&lt;td style="padding-bottom: 1pt;"&gt;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;(194,548&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 1pt;"&gt;)&lt;/td&gt;
&lt;td style="padding-bottom: 1pt;"&gt;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 1pt; border-bottom-style: solid;"&gt;(163,505&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 1pt;"&gt;)&lt;/td&gt;
&lt;/tr&gt;
&lt;tr style="vertical-align: bottom; background-color: #cceecc;"&gt;
&lt;td style="text-indent: -11pt; padding-bottom: 2.5pt; padding-left: 11pt;"&gt;&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;625,222&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;&lt;/td&gt;
&lt;td style="padding-bottom: 2.5pt;"&gt;&lt;/td&gt;
&lt;td style="text-align: left; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;$&lt;/td&gt;
&lt;td style="text-align: right; border-bottom-color: black; border-bottom-width: 2.5pt; border-bottom-style: double;"&gt;926,236&lt;/td&gt;
&lt;td style="text-align: left; padding-bottom: 2.5pt;"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;p style="font: 10pt/normal times new roman, times, serif; margin: 10pt 0px 0px; font-size-adjust: none; font-stretch: normal;"&gt;Offsite demo equipment represents the cost of products physically located at customer locations, during an orientation period for which the Company retains title. As such, no depreciation expense has been recorded on these units. The inventory reserve at June 30, 2013 includes amounts necessary to adjust the Company&amp;#8217;s inventory and offsite demo equipment to net realizable value following the Company&amp;#8217;s release of newly redesigned products in 2012.&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>The entire disclosure for inventory. This may include, but is not limited to, the basis of stating inventory, the method of determining inventory cost, the major classes of inventory, and the nature of the cost elements included in inventory. If inventory is stated above cost, accrued net losses on firm purchase commitments for inventory and losses resulting from valuing inventory at the lower-of-cost-or-market may also be included. For LIFO inventory, may disclose the amount and basis for determining the excess of replacement or current cost over stated LIFO value and the effects of a LIFO quantities liquidation that impacts net income.</ElementDefenition><ElementReferences>Reference 1: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 210

 -SubTopic 10

 -Section 50

 -Paragraph 1

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 -Publisher AICPA

 -Name Accounting Research Bulletin (ARB)

 -Number 43

 -Section A

 -Paragraph 9

 -Chapter 3

 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

 -Publisher FASB

 -Name Accounting Standards Codification

 -Topic 210

 -SubTopic 10

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 -Paragraph 1

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 -URI http://asc.fasb.org/extlink&amp;oid=6877327&amp;loc=d3e13212-122682



Reference 4: http://www.xbrl.org/2003/role/presentationRef

 -Publisher SEC

 -Name Regulation S-X (SX)

 -Number 210

 -Section 02

 -Paragraph 6

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