Features: 1.Induction tachometer for 2?stroke or 4?stroke gasoline engines, recording and displaying 99999 hours / 20000 RPM. 2.Support accumulated running time TOT, record part of running time JOB, and the maintenance timer can be freely set to 0?200 hours SVC. 3.The operation of the Hour meter is connected by5 ft. insulated wire. You need wind the wire around the spark plugs about 5 times. The gauge is activated by the engine's spark. 4.Measuring the current engine speed, record and view the maximum engine speed, and set the overspeed warning function. The refreshed rate can be set to 0.5S or 1S. The tachometer displays the current RPM when the engine is running. 5.With reminder service, users can set this LCD tachometer from 0 hours to 200 hours. Replaceable CR2032 battery, automatically stores data after battery replacement. Specification: Item Type: Tachometer Material: ABS Color: Black Battery: CR2032 button battery, 210mAH (built-in) Waterproof Rate: IP65 Induction Wire: Approx. 1.5M/4.9ft Product Size: Approx. 67.1 x 35 x 17.6mm/2.6 x 1.4 x 0.7in Display Screen: LCD+ Green Backlight Screen Size: Approx. 40.9 x 16.9mm/1.6 x 0.7in Induction Wire Type: UL2464 26AWG/2C Refresh Rate: 0.5S/1S Hours Range: 0-99999H RPM Range: 0-20000RPM RPM Alert Setting Range:1000-20000RPM N.W.46.7 Length Battery Specification: CR2032 210mAH Timing Accuracy:0.1H Maintinance Timer:0-200H RPM Accuracy:10RPM Function: Timing System Including: Total running hours TOT,total hours are non-resettable Partial running time JOB,partial hours are resettable Maintenance timer can be set freely to 0-200 hours SVC Hours Range 0-99,999.9 hours with 0.1 hours accuracy RPM Measuring System: Measuring current engine RPM recording and recall engine Maximum RPM Setting overspeed warning function and can resettable RPM Range 0- 20,000,RPMs with 10 RPM accuracy. Replaceable CR2032 battery. Applicative Engine Types: 2 Stroke Gasoline Engine of 1 Cylinder/ 2 Cylinders/ 3 Cylinders 4 Stroke Gasoline Engine of 1 Cylinder/ 2 Cylinders/ 3 Cylinders/ 4 Cylinders/ 5 Cylinders/ 6 Cylinders/ 8 Cylinders/ 12 Cylinders