Exhibit 99.1

      CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
                                   PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, John D. Heaton, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual
Report of Nanometrics Incorporated on Form 10-K for the annual period ended
December 31, 2002 fully complies with the requirements of Section 13(a) or 15(d)
of the Securities Exchange Act of 1934 and that information contained in such
Annual Report on Form 10-K fairly presents in all material respects the
financial condition and results of operations of Nanometrics Incorporated.


                                      By: /s/ John D. Heaton
                                         ------------------------------
                                      Name:      John D. Heaton
                                      Title:     Chief Executive Officer


I, Paul B. Nolan, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual
Report of Nanometrics Incorporated on Form 10-K for the quarterly period ended
December 31, 2002 fully complies with the requirements of Section 13(a) or 15(d)
of the Securities Exchange Act of 1934 and that information contained in such
Annual Report on Form 10-K fairly presents in all material respects the
financial condition and results of operations of Nanometrics Incorporated.


                                     By: /s/ Paul B. Nolan
                                        -----------------------
                                     Name:      Paul B. Nolan
                                     Title:     Chief Financial Officer