Exhibit 99.1

Certification

The undersigned officer of Harvard Bioscience, Inc. (the “Company”) hereby certifies that the Company’s quarterly report on Form 10-Q for the quarterly period ended March 31, 2003 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934, as amended, and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.  This certification is provided solely pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, and shall not be deemed to be a part of the Report or “filed” for any purpose whatsoever.

Date: May 14, 2003	Name:	/s/ Chane Graziano
		Chane Graziano
	Title:	Chief Executive Officer