Keep tracks of gas engine total and partial running hours; Perform the regular maintenance tasks(eg air filter and oil change) to determine when the time is due;Total and partial hours range: 0-999,999 hours,Maintenance time range: 0-1000 hours Display the engine current RPM value and highest RPM hit since engine started to adjust the idle speed; Various of engine firing patterns can be chosen for RPM accuracy correction;RPM measurement range:0 to 30000RPM epoxy resin sealing craft can be kept it away from the damp or moist, which also prevent the strong shock between transport Easy to mount it on any proper place by stick-on or screw-on; One wire hook-up design for engine signal receipt,the power cable is workable whatever wire shorten or extend(wire length:1 75m,approx 68 8 inches, extend range not exceed 5m,approx 196 inches)Material: ABScolour: blackPackage Contents:1 x inductive hour meterOnly the above package content, other products are not included Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing The measurement allowed error is +/- 1-3cm