RL-HM016R Digital resettable inductive Tach/Hour meter. It can work on most 2 or 4 stroke gas engine. It has a powerful timing system, RPM measuring system as well as some other function design. Timing System Including: accumulating total running hours TOT, recording partial running time PAr,Partial timer is resettable, etc. RPM Measuring System Including:measuring current engine RPM,recording MAX RPM 5s after engine stopped, RPM refresh rate 1S ,etc Design Including: easy installed,waterproof Rate IP68,etc. 1.This tach hour meter record gasoline engine's total running hours and partial time by the induction from spark plug cable. 2.The hour meter shows total hours and partial time accumulated. Partial timing can be viewed and reset . 3.The tach hour meter shows current RPM's and total running hours when the engine is running. RPM accuracy is 10RPM. 4.Compared with the tachometer with pointer, it displays RPM more accurate. 5.What's more outstanding is that the tach hour meter can display engine's MAX RPM within once working period 5s after engine stopped. Product Name: Tachometer Timing Range: 0-99999H Speed Range: 0-30000RPM Refresh Rate: 0.5S Battery Type: CR2050 Waterproof Grade: IP68 Product Model: RL-HMO16R Timing Accuracy: 0.1/1H Speed Accuracy: 10RPM Display Mode: LCD Inductive Line Length: 1.1m Scope of Application: Motorcycle, kart, motorboat, ATV, lawn mower, rice transplanter, paraglider, generator, outboard motor Colour:Black Material:ABS Package Contents: 1 x Speed Hour Meter 1 Cord 2 x Cable Ties Only 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.