MESA LABORATORIES INC /CO/ — Director's Dealing 2013

Feb 7, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: MESA LABORATORIES INC /CO (MLAB)
CIK: 0000724004
Period of Report: 2013-02-05

Reporting Person: PETERSON STEVEN W (Former Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-02-05	Common Stock	F	1210	$52.74	Disposed	20152	Direct
2013-02-05	Common Stock	M	2500	$25.56	Acquired	22652	Direct
2013-02-05	Common Stock	F	942	$52.74	Disposed	21710	Direct
2013-02-05	Common Stock	M	3000	$16.6	Acquired	24710	Direct
2013-02-05	Common Stock	F	1120	$52.74	Disposed	23590	Direct
2013-02-05	Common Stock	M	2700	$21.93	Acquired	26290	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-02-05	Non Qualified Stock Option	$25.56	X	2500	Disposed	2020-04-01	Common Stock (2500)	Direct
2013-02-05	Non Qualified Stock Option	$16.6	X	3000	Disposed	2019-04-01	Common Stock (3000)	Direct
2013-02-05	Non Qualified Stock Option	$21.93	X	2700	Disposed	2018-04-01	Common Stock (2700)	Direct

Footnotes

F1: 25% of Grant Exercisable on each of the first 4 anniversary dates following 04/01/2010

F2: 25% of Grant Exercisable on each of first 4 anniversary dates following 04/01/2009

F3: 25% of Grant Exercisable on each of the first 4 anniversary dates following 04/01/2008