EXHIBIT 16.1 November 11, 2004 U.S. Securities and Exchange Commission Office of the Chief Accountant 450 Fifth Street, NW Washington, D.C. 20549 Re: Cell Robotics International Inc. File No. 5049-05 Dear Sir or Madam: We have read Item 4.01 of Form 8-K of Cell Robotics International Inc. dated November 5, 2004 and agree with the statements concerning our Firm contained therein. Very truly yours, /s/ Grant Thornton LLP Copies to: Dr. Toby L. Simon, Chairman Audit Committee of the Board of Directors Cell Robotics International Inc. Mr. Eutimio L. Sena Chief Executive Officer Cell Robotics International Inc. Suite 565 6501 America Parkway N.E. Albuquerque, NM 87110 T 505.855.7900 F 505.855.7971 W www.grantthornton.com Grant Thornton LLP US Member of Grant Thornton International