Feature 1 TECHNICAL PARAMETERS: Pulse engine tachometer timing range from 1 minute to 99999(Minimum minute), 1% accuracy, use in the measurement of up to 8 cylinders(rotation speed RPM) of 2 stroke or 4 stroke fuel or gasoline engines, engine working timing accumulation time 2 BATTERY POWEREDSmall engine pulse tachometer support LCD display, low voltage design, built in battery (CR2450) power supply mode, inductive design, safe and reliable 3 ENERGY SAVING AND POWER SAVING: When the gasoline engine is not working, the tachometer will automatically save energy and power, and automatically turn off display; when the gasoline engine is working, the tachometer will automatically start the test, convenient and practical 4 A VARIETY OF MEASUREMENT METHODS: After one end of the electronic wire is installed on the electronic watch casing, use a metal clip to clamp on the spark plug wire sheath for inductive measurement, the electronic wire is bundled on the spark plug wire sheath and wound for a few times to sense and measure, handheld tachometer measure 3cm to 5cm near the sheath of the spark plug wire 5 APPLICABLE SCENARIO: Digital induction tachometer is suitable for gasoline, engines, chainsaws, lawnmowers, gliders, motorcycles, automobiles, karts, engineering vehicles, snowmobiles, ATVs, motor boats, grinders, generators, vibration machine mechanical equipment and so onItem Type: Pulse Engine TachometerMaterial: ABS and PCBSpeed: 100-30000 RPMTiming Range: 1 Minute-99999 minutesBattery: 1 x CR2450 150mAh Package List1 x Tachometer1 x Spark Plug Wire1 x User Manual