[LETTERHEAD OF DELOITTE & TOUCHE LLP] January 30, 1996 Mr. William Roenitz Controller and Assistant Treasurer Bio-Logic Systems Corp. One Bio-Logic Plaza Mundelein, IL 60060 Dear Mr. Roenitz: This is to confirm that the client-auditor relationship between Bio-Logic Systems Corp. (Commission File No. 0-12231) and Deloitte & Touche LLP has ceased. Yours truly, /s/ Deloitte & Touche LLP cc: Office of the Chief Accountant SECPS Letter File Securities and Exchange Commission Mail Stop 9-5 450 Fifth Street, N.W. Washington, D.C. 20549 Gabriel Raviv, Ph.D., President and Chief Executive Officer