X0306 4 2015-07-27 1 0000728331 SUTRON CORP STRN 0001530535 Raval Ashish H. 22400 DAVIS DRIVE STERLING VA 20164 1 1 0 0 Senior Vice President Common Stock 2015-07-27 4 U 0 28750 8.50 D 0 D Common Stock 2015-07-27 4 U 0 5000 8.50 D 0 I By spouse Non-Qualified Stock Option 6.90 2015-07-27 4 H 0 50000 1.60 D 2017-02-27 Common Stock 50000 0 D Non-Qualified Stock Option 6.47 2015-07-27 4 H 0 25000 2.03 D 2020-05-19 Common Stock 25000 0 D Non-Qualified Stock Option 4.52 2015-07-27 4 H 0 100000 3.98 D 2024-05-21 Common Stock 100000 0 D Restricted Stock Units 2015-07-27 4 H 0 12500 8.50 D Common Stock 12500 0 D Pursuant to the Agreement and Plan of Merger, dated June 21, 2015, by and among Danaher Corporation, Satellite Acquisition Corp., and Sutron Corporation (the "Merger Agreement"), this option was vested in full and cancelled in the merger in exchange for a cash amount equal to the number of shares underlying this option multiplied by the difference between the per share merger consideration of $8.50 and the per share exercise price of this option 1 unit for 1 share Pursuant to the Merger Agreement, the restricted stock units were converted into a dollar amount equal to the product of the number of restricted stock units and the merger consideration of $8.50 per share /s/ Ashish Raval 2015-07-28