POWER OF ATTORNEY


	Know all by these presents, that the undersigned hereby constitutes and
appoints each of Mark Plush and Marcia Miller, signing singly, the undersigned's
true and lawful attorney-in-fact to:

1.	execute for and on behalf of the undersigned, in the undersigned's capacity
as an officer and/or director of Keithley Instruments, Inc. (the "Company"),
Forms 3, 4, and 5 in accordance with Section 16(a) of the Securities Exchange
Act of 1934, as amended, and the rules thereunder;

2.	do and perform any and all acts for and on behalf of the undersigned which
may be necessary or desirable to complete and execute any amendment or
amendments to such Forms, and timely file such Forms with the United States
Securities and Exchange Commission and any stock exchange or similar authority;
and

3.	take any other action of any type whatsoever in connection with the foregoing
which in the opinion of such attorney-in-fact, may be of benefit to, in the best
interest of, or legally required by, the undersigned, it being understood that
the documents executed by such attorney-in-fact on behalf of the undersigned
pursuant to this Power of Attorney shall be in such form and shall contain such
terms and conditions as such attorney-in-fact may approve in such
attorney-on-fact's discretion.

        The undersigned hereby grants to each such attorney-in-fact full power
and authority to do and perform any and every act and thing whatsoever
requisite, necessary, or proper to be done in the exercise of any of the rights
and powers herein granted, as fully to all intents and purposes as the
undersigned might or could do if personally present, with full power of
substitution or revocation, hereby ratifying and confirming all that such
attorney-in-fact, or such attorney-in-facts' substitute or substitutes, shall
lawfully do or cause to be done by virtue of this Power of Attorney and the
rights and powers herein granted.

        This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of and transactions in securities by the Company, unless
earlier revoked by the undersigned in a signed writing delivered to the
foregoing attorneys-in-fact.

	The undersigned acknowledges that the foregoing attorneys-in-fact, in serving
in such capacity at the request of the undersigned, are not assuming, nor is the
Company assuming, any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.


	IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 3rd day of April, 2007.





                                         /s/Suzanne Schulze Taylor
                                         Signature



                                         Suzanne Schulze Taylor
                                         Print Name