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MESA LABORATORIES INC /CO/ Director's Dealing 2010

May 24, 2010

33153_dirs_2010-05-24_a288494f-8f2c-41a9-abc5-5adb04d3d88f.zip

Director's Dealing

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SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MESA LABORATORIES INC /CO (MLAB)
CIK: 0000724004
Period of Report: 2010-04-16

Reporting Person: CAMPBELL H STUART (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-04-16	Common Stock	F	2702	$25.5	Disposed	94648	Direct
2010-04-16	Common Stock	M	600	$16.6	Acquired	95248	Direct
2010-04-16	Common Stock	M	900	$21.93	Acquired	96148	Direct
2010-04-16	Common Stock	M	500	$18.98	Acquired	96648	Direct
2010-04-16	Common Stock	M	1350	$15.44	Acquired	97998	Direct
2010-04-16	Common Stock	M	750	$11.91	Acquired	98748	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2010-04-16	NQ Stock Option	$16.6	X	600	Disposed	2019-04-01	Common Stock (600)	Direct
2010-04-16	NQ Stock Option	$21.93	X	900	Disposed	2018-04-01	Common Stock (900)	Direct
2010-04-16	NQ Stock Option	$18.98	X	500	Disposed	2017-05-11	Common Stock (500)	Direct
2010-04-16	NQ Stock Option	$15.44	X	1350	Disposed	2016-03-20	Common Stock (1350)	Direct
2010-04-16	NQ Stock Option	$11.91	X	750	Disposed	2015-06-14	Common Stock (750)	Direct