Exhibit 99.1


          Bio-Rad Laboratories, Inc.,

          CERTIFICATION  PURSUANT TO  18  U.S.C. SECTION  1350, AS  ADOPTED
          PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACTION OF 2002

          I,   David  Schwartz,   of   Bio-Rad  Laboratories,   Inc.   (the
          "Registrant"),  do hereby  certify in  accordance with  18 U.S.C.
          1350, as  adopted pursuant to  Section 906 of  the Sarbanes-Oxley
          Act of 2002, that:

               1.   the Quarterly Report on Form 10-Q of the Registrant, to
                    which this  certificate is attached as  an exhibit (the
                    "Report"),  fully complies  with  the  requirements  of
                    section 13(a)  of the  Securities Exchange Act  of 1934
                    (15 U.S.C. 78m); and

               2.   the   information  contained   in  the   Report  fairly
                    presents,  in  all  material  respects,  the  financial
                    condition and results of operations of the Registrant.



          Dated:   November 13, 2002         /s/ David Schwartz
                                             -----------------------
                                             David Schwartz
                                             Chief Executive Officer
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