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. Tachometer Wide Applications: This tachometer for small engines is waterproof and powerful. Built-in CR2450 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 Tachometer Hour Meter: Digital tachometer high-quality new instrument and hour meter with large non-destructive installation LCD display. Chainsaw tachometer be suitable for any 2-stroke gasoline cart engines in the 30,000+ RPM range. 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. Energy saving- When the gasoline engine is not working, the tachometer will automatically save energy and power, and the display will be automatically turned off; When the gasoline engine is in operation, the tachometer automatically starts the test. The battery can be used for 4-5 years. Chainsaw Tachometer-Digital Tachometer Tach Gauge Small Engine Tachometer Digital Display Pulse Speedometer for Jet Engine Chain Saw Cropper Generator Lawn Mower RV ATV Dirt