saving: When the gasoline engine is not working, the tachometer automatically save and power, and the display be automatically turned off; When the gasoline engine is in operation, the tachometer automatically starts the test. Reset Function at Zero Hour: This upgraded rpm gauge tachometer with a reset function, which can reset total hours and maintenance time.The hour meter reads up to 10,000 hours, hour meter then returns to zero, the rpm meter can read up to 99,999 RPM,tachometer for small engines. Tachometer Hour Meter: The inductive tachometer is suitable for any two-stroke or four-stroke gasoline engine and is suitable for cart engines with a speed range above 30,000 rpm.Measuring speed range (RPM): 100RPM to 30000RPM. Easy to Use: This small engine tachometer is equipped with a clip, just use the provided clip to clip the spark wire.Tachometer for small engines body-inductive design, the cable can be operated by the bundle of spark plugs. Wide Applications: This tachometer for small engines is waterproof and powerful.Built-in battery in lasting power, low voltage design, safe and reliable.Extensive use of various chain saw, cropper, generator, lawn mower, RV ATV, dirt, bike, motocross, boat, tractor, and small gasoline engines., Weight: 0.13889122506 Pounds, Manufacturer: HuddleGlow