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23. Consent of experts

                       CONSENT OF INDEPENDENT ACCOUNTANTS
                       ----------------------------------

We herby consent to the incorporation by reference in the Registration
Statement on Form S-8 (No. 333-21999) of Keithley Instruments, Inc. of our
report dated June 16, 2000 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 28, 2000