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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

FORM 4

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
Section 17(a) of the Public Utility Holding Company Act of 1935
or Section 30(h) of the Investment Company Act of 1940

o Check this box if no longer
subject to Section 16.
Form 4 or Form 5
obligations may continue.
See Instruction 1(b)

1.	Name and Address of Reporting Person* (Last, First, Middle)	2.	Issuer Name and Ticker or Trading Symbol				3.	I.R.S. Identification Number of Reporting Person, if an entity (Voluntary)
	Reddy, N. Mohan		Keithley Instruments, Inc. KEI
	3989 Orangewood Drive	4.	Statement for (Month/Day/Year)				5.	If Amendment, Date of Original (Month/Day/Year)
			March 10, 2003
	(Street)	6.	Relationship of Reporting Person(s) to Issuer (Check All Applicable)				7.	Individual or Joint/Group Filing (Check Applicable Line)
	Orange Village, OH 44122 (City)                (State)           (Zip)		x	Director	o	10% Owner		x	Form filed by One Reporting Person
			o	Officer (give title below)				o	Form filed by More than One Reporting Person
			o	Other (specify below)

Reminder:	Report on a separate line for each class of securities beneficially owned directly or indirectly.
*	If the form is filed by more than one reporting person, see instruction 4(b)(v).

Table I — Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.

Title of Security (Instr. 3)

2.

Transaction Date (Month/Day/Year)

2a.

Deemed Execution Date, if any. (Month/Day/Year)

3.

Transaction Code (Instr. 8)

4.

Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)

5.

Amount of Securities Beneficially Owned Following Reported Transactions(s) (Instr. 3 and 4)

6.

Ownership Form: Direct (D) or Indirect (I) (Instr. 4)

7.

Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

Amount

(A) or (D)

Price

Common Shares

- -0-

Page 2

Table II — Derivative Securities Acquired, Disposed of, or Beneficially Owned   (e.g., puts, calls, warrants, options, convertible securities)

1.

Title of Derivative Security (Instr. 3)

2.

Conversion or Exercise Price of Derivative Security

3.

Transaction Date (Month/Day/Year)

3a.

Deemed Execution Date, if any (Month/Day/Year)

4.

Transaction Code (Instr. 8)

5.

Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)

Code

V

(A)

(D)

Common Stock Option

$13.4650

9/20/01

Common Stock Option

$19.23

2/16/02

Common Stock Option

$10.70

2/15/03

Phantom Stock Units

$17.10

12/10/01

Phantom Stock Units

$19.0971

2/20/02

Phantom Stock Units

$18.400

5/6/02

Phantom Stock Units

$14.310

7/22/02

Phantom Stock Units

$14.940

9/9/02

Phantom Stock Units

$12.4147

12/6/02

Phantom Stock Units

$11.25

2/18/03

Phantom Stock Units

$10.7573

3/10/03

A

70.45

Page 3

Table II — Derivative Securities Acquired, Disposed of, or Beneficially Owned — Continued (e.g., puts, calls, warrants, options, convertible securities)
6.	Date Exercisable and Expiration Date (Month/Day/Year)		7.	Title and Amount of Underlying Securities (Instr. 3 and 4)		8.	Price of Derivative Security (Instr. 5)		9.	Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)		10.	Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11.	Nature of Indirect Beneficial Ownership (Instr. 4)
	Date Exercisable	Expiration Date		Title	Amount or Number of Shares
	3/21/02	9/20/11		Common Stk	5,000			$ -			5,000		D
	8/17/02	2/16/12		Common Stk	10,000			$ -			10,000		D
	8/16/03	2/15/13		Common Stk	10,000			$ -			10,000		D
	(1)	(1)		Common Stk	207.35			$ -			207.35		D
	(1)	(1)		Common Stk	195.30			$ -			195.30		D
	(1)	(1)		Common Stk	203.08			$ -			203.08		D
	(1)	(1)		Common Stk	261.19			$ -			261.19		D
	(1)	(1)		Common Stk	284.42			$ -			284.42		D
	(1)	(1)		Common Stk	342.26			$ -			342.26		D
	(1)	(1)		Common Stk	334.89			$ -			334.89		D
	(1)	(1)		Common Stk	70.45			$ -			70.45		D

Explanation of Responses:

(1) The phantom stock units were accrued under the Keithley Instruments, Inc. Deferred Stock Plan and are to be settled in common stock upon the retirement from the Board of the reporting person.

Mark J. Plush, Attorney-In Fact	3/10/03
**Signature of Reporting Person	Date

**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note:	File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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