Trail Tech (723-A00 Orange TTO Digital Tachometer Plus 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)