X0303 4 2010-12-28 0 0000724004 MESA LABORATORIES INC /CO MLAB 0001260286 PETERSON STEVEN W 12100 W 6TH AVE LAKEWOOD CO 80228 0 1 0 0 CFO and Secretary Mesa Laboratories, Inc. Common Stock 2010-12-28 2010-12-28 4 F 0 310 31.49 D 60792 D Mesa Laboratories, Inc. Common Stock 2010-12-28 2010-12-28 4 M 0 675 14.5 A 61467 D Incentive Stock Options 14.5 2010-12-28 2010-12-28 4 X 0 675 14.5 D 2010-04-27 2011-04-27 Mesa Laboratories, Inc. Common Stock 675 14700 D Steven W. Peterson 2011-01-03