Exhibit 99.1

                        CERTIFICATION OF PERIODIC REPORT

I, Michael A. McManus, Jr., President and Chief Executive Officer of MISONIX,
INC. (the "Company"), certify, pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002, 18 U.S.C. Section 1350, that:

(1) the Quarterly Report on Form 10-Q of the Company for the six months ended
December 31, 2002 (the "Report") fully complies with the requirements of Section
13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m or 78o(d));
and

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

Dated:  February 10, 2003
                                           /s/ Michael A. McManus, Jr.
                                           -------------------------------------
                                           Michael A. McManus, Jr.
                                           President and Chief Executive Officer


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