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. 333-2199) of Keithley Instruments, Inc. of our report
dated June 6, 2003 relating to the financial statements of Keithley Instruments,
Inc. Retirement Savings Trust and Plan, which appears in this Form 11-K.

/s/PricewaterhouseCoopers LLP

Cleveland, Ohio
June 26, 2003