Trail Tech (723-R00 Orange TTO Digital Hour Meter The number of hours an engine has been running is critical to its maintenance schedule Attach one to your motorcycle, ATV or lawn-mower and be aware of upcoming service requirements TTO is the smallest available meter at 50mm x 25mm x 14mm and has large, easy to read digits displaying Accumulated Run Time and Engine RPM Easily mount it to any surface using either the bolt-on (Screws not included) or peel-n-stick mounting option Physical Dimensions: 25mm Weight x 50mm Height x 14mm Depth (1" Weight x 2" Height x .5" Depth), Weight: 1.3 oz. (39.3 grams)