WRITTEN CONSENT
                                 OF STOCKHOLDERS OF
                                    HACH COMPANY
                                          
                             DATED AS OF APRIL 21, 1999
                                          
     Pursuant to the provisions of Section 228 and Section 251 of the General 
Corporation Law of the State of Delaware, the undersigned each holding and 
having voting power over that number of shares of Common Stock, par value 
$1.00 per share, of Hach Company, a Delaware corporation (the "Company") and 
that number of shares of Class A Common Stock, par value $1.00 per share, of 
the Company (together, "Company Common Stock") set forth adjacent to his or 
her name below, collectively constituting a majority of the voting power of 
the issued and outstanding Company Common Stock, do hereby consent to, 
approve and adopt the following resolution:

          WHEREAS, contemporaneously with this resolution, the Board of 
     Directors of the Company has determined that the merger (the "Merger") 
     of H(2)O Acquisition Corp., a Delaware corporation ("Merger Sub"), with 
     and into the Company is fair and advisable and in the best interest of 
     the Company and its stockholders, has approved and adopted the Agreement 
     and Plan of Merger, dated as of April 20, 1999, among Danaher 
     Corporation, a Delaware corporation ("Parent"), Merger Sub and the 
     Company in the form attached to this consent (the "Merger Agreement") 
     and the Merger, and has submitted the Merger Agreement to, and 
     recommended the approval and adoption of the Merger Agreement and the 
     Merger by, the stockholders of the Company.

          NOW THEREFORE, BE IT RESOLVED, that the Merger Agreement and the
     Merger be, and they hereby are, consented to, approved and adopted in all
     respects.


This Consent may be executed in one or more counterparts, all of which shall 
be considered one and the same instrument.



                                            
  /s/ Kathryn C. Hach-Darrow       4,546,990      shares Common Stock
- ----------------------------
Name: Kathryn C. Hach-Darrow       4,541,647      shares Class A Common Stock



 /s/ Bruce J. Hach                 238,350        shares Common Stock
- ----------------------------
Name: Bruce J. Hach                227,514        shares Class A Common Stock