Features: Multifunction Hour meter ---- You can set up the initial value to replace an old device; TOT and the partial timer(JOB) range are the same:0-99999 H,0.1/1H accuracy, and the JOB can be reset; selectable maintenance reminder(5-1000H/OFF). Tachometer ----9 Programmable engine firing patterns is to monitor accurately;RPM range:0-25000 RPM;Reset max RPM;Alert overspeed. Multi-Screen Display ---- Multiple interfaces can be displayed at the same time for easy reading of the clock, RPM, and timer. Others: Backlight display; Replaceable battery CR2032 with long endurance; Waterproof rate: IP67; User shutdown; Record engine work times. It is a multi-function hour meter, it has hours and a tachometer. In addition, the hour meter can record TOT, resettable partial timer, and countdown maintenance value; the tachometer can record real-time rpm, max rpm(can be reset), alert overspeed; backlight display; user shutdown; record the times of engine working; replacement battery reminder; waterproof rate: IP67. Suitable for small gasoline engines, such as scooters, mini bike, garden tractor, snowmobile, dump truck, motorcycle, and etc. Hours Keep track of engine total run time(TOT), it is non-resettable and back to 0 when it exceeds 99999H. Record the partial working time(JOB), it is resettable. Perform the necessary maintenance task(SVC) such as oil/air change, and remind the due time. TOT&JOB time range: 0-99999 H. SVC range:5-1000 H. It can be turned off. RPM Monitor and display the current RPM value when the engine is on. Display the highest RPM hit since the engine started. Adjust the idle revolution by different engine firing patterns. RPM Range: 0-25000RPM Maximum RPM warning. Suitable for gas engines: 2 stroke 1 cylinder/2 stroke 2 cylinder/2 stroke 3 cylinder 4 stroke 1 cylinder/4 stroke 2 cylinder/4 stroke 3 cylinder/4 stroke 4 cylinder/4 stroke 5 cylinder/4 stroke 6 cylinder/4 stroke 8 cylinder/4 stroke 12 cylinder/4 stroke 16 cylinder Package Included: 1*Engine Tachometer