Exhibit (a)(12)

                               DANAHER CORPORATION
                    2099 Pennsylvania Avenue, NW, 12th Floor
                           Washington, D.C. 20006-1813


                                                       TELEPHONE (202) 828-0850
                                                       TELECOPIER (202) 828-0860



FOR IMMEDIATE RELEASE                  CONTACT:   PATRICK W. ALLENDER
                                                  CHIEF FINANCIAL OFFICER
                                                  (202) 828-0850



                  DANAHER CORPORATION COMPLETES TENDER OFFER

                          FOR MICROTEST, INC.

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      Washington, D.C., July 24, 2001 - Danaher Corporation (NYSE:DHR) announced
today that it has completed its tender offer for outstanding shares of
Microtest, Inc. (NASDAQ:MTST) common stock, at a price of $8.15 per share. The
tender offer expired at 12:00 midnight on July 23, 2001. Danaher Corporation has
been advised by the depositary for the tender offer that as of the expiration of
the tender offer 7,856,064 shares of Microtest common stock (including 36,248
shares subject to guaranteed delivery), representing approximately 90.611% of
the outstanding shares of common stock, had been validly tendered and not
withdrawn pursuant to the offer and has accepted such shares for payment. As
previously announced, Danaher Corporation plans to acquire the remaining
Microtest shares at $8.15 per share through a cash merger, expected to be
completed shortly.

      Microtest is a leading provider of network test and connectivity products.

      Danaher Corporation is a leading manufacturer of Process/Environmental
Controls and Tools and Components. (www.danaher.com)

      Statements in this document that are not strictly historical may be
"forward-looking" statements, which involve risks and uncertainties. These
include economic and currency conditions, market demand, pricing, and
competitive and technological factors, among others, as set forth in the
companies' respective SEC filings.