EXHIBIT 23(c)



                      CONSENT OF INDEPENDENT ACCOUNTANTS
                                       
                                       
                                       
We consent to the inclusion in this registration statement on Form S-4 of our 
report dated February 6, 1998, on our audit of the consolidated financial 
statements of Environmental Test Systems, Inc. and subsidiaries as of and for 
the year ended December 31, 1997.  We also consent to the reference to our 
firm under the caption "Experts."



                                        COOPERS & LYBRAND L.L.P.



South Bend, Indiana
March 23, 1998