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 POWERED：Small 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 on Specification: Item Type: Pulse Engine Tachometer Material: ABS and PCB Speed: 100-30000 RPM Timing Range: 1 Minute-99999 minutes Battery: 1 x CR2450 150mAh. Package List: 1 x Tachometer 1 x Spark Plug Wire 1 x User Manual