Exhibit 16.1 November 2, 1998 Mrs. Patricia DiIanni Chief Financial Officer MRS Technology, Inc. 10 Elizabeth Drive Chelmsford, MA 01824-4112 Dear Mrs. DiIanni: This is to confirm that the client-auditor relationship between MRS Technology, Inc. (Commission File Number 0-21908) and PricewaterhouseCoopers L.L.P. has ceased. Very truly yours, /s/PricewaterhouseCoopers L.L.P. cc: Office of the Chief Accountant SECS Letter File Securities and Exchange Commission Mail Stop 11-3 450 Fifth Street, N.W. Washington, D.C. 20549