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 time2. BATTERY POWERED：Small engine pulse tachometer support LCD display, low voltage design, built in battery (CR2450) power supply mode, inductive design, safe and reliable3. 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 practical4. 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 wire5. 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 onSpecification:Item Type: Pulse Engine TachometerMaterial: ABS and PCBSpeed: 100-30000 RPMTiming Range: 1 Minute-99999 minutesBattery: 1 x CR2450 150mAh.Package List:1 x Tachometer1 x Spark Plug Wire1 x User Manual