X0202 4 2007-03-26 0 0000724004 MESA LABORATORIES INC /CO MLAB 0001257603 CAMPBELL H STUART 12100 W 6TH AVENUE LAKEWOOD CO 80228 1 0 0 0 Common Stock 2007-03-26 4 M 0 1000 5.91 A 91000 D Common Stock 2007-03-26 4 M 0 1000 7 A 92000 D Common Stock 2007-03-26 4 M 0 1000 10 A 93000 D Common Stock 2007-03-26 4 M 0 750 11.91 A 93750 D Common Stock 2007-03-26 4 M 0 650 15.44 A 94425 D non statutory purchase option 5.91 2007-03-26 4 X 0 1000 0 D 2006-10-15 2012-10-15 common stock 1000 0 D non statutory purchase option 7 2007-03-26 4 X 0 1000 0 D 2006-06-18 2013-06-18 common stock 1000 1000 D non statutory purchase option 10 2007-03-26 4 X 0 1000 0 D 2006-07-14 2014-07-14 common stock 1000 2000 D non statutory purchase option 11.91 2007-03-26 4 X 0 750 0 D 2006-06-14 2015-06-14 common stock 750 2250 D non statutory purchase option 15.44 2007-03-26 4 X 0 675 0 D 2007-03-20 2016-03-20 common stock 675 2025 D /s/ H. Stuart Campbell 2007-03-28