Exhibit 23. Consent of Experts

                       CONSENT OF INDEPENDENT ACCOUNTANTS

We hereby consent to the incorporation by reference in the Registration
Statement on Form S-8 (No. 33-2496) of Keithley Instruments, Inc. of our reports
dated December 11, 2003 relating to the financial statements and financial
statement schedule, which appear in this Form 10-K.

/s/ PricewaterhouseCoopers LLP
Cleveland, Ohio
December 11, 2003