Pulse Engine Chainsaw Tachometer: used in the measurement of up to 8 cylinders, widely used in 2 stroke or 4 stroke fuel or gasoline engines; Measuring range is 100-30000 RPM; Measurement accuracy is 1%; Timed in minutes, timing range is 1-99999 (min) Inductive Design Tachometer: The handheld digital induction chainsaw tachometer is inductive design; low voltage design; LCD display; built-in battery power supply; safe and reliable; This tach gauge comes with a clip to hold the spark wire Zero and Reset Function: Long-press "SET" key, screen display 01, 02, 03, 04 in sequence, until display "04" and flash 3~5 s stop flashing to activate reset; Simultaneous press "MODE" and "SET" until fullscreen, clear recorded operate time and speed data Measurement Methods: a metal clip snaps electronic wire onto spark plug wire housing for induction measure; electronic harness wrap around spark plug wire sleeve to sense measure; handheld tachometer 3 - 5 cm near sheath of spark plug wire to measure Wide Applicable: for 1-8 strokes cylinders gasoline engines, such as chainsaws, lawn mowers, gliders, motorcycles, automobiles, karts, engineering vehicles, snowmobiles, ATVs, motor boats, grinders, generators, Vibration machine mechanical equipment Energy Saving: convenient and practical, when gasoline engine is not working, tachometer will automatically save energy and power, and automatically turn off the display; when gasoline engine is working, the tachometer will automatically start the test 4 Modes: 01,02,03 mode is a simple multiplier relationship (e.g., 01 = 1×, 02 = 2×, 03 = 4×), 04 mode is for reset. the default is 02 mode, If your engine idle speed is 1000 rpm, the readout data is 2000, then choose 01 mode. If the readout data is about 1000 rpm, then choose 02 mode. If the readout date is about 500 rpm, then choose 03 mode. Please not: mode 02 ≠ 2-stroke engines, mode 03 and mode 04≠ 4-stroke engines 【Tachometer Hour Meter】This high quality new instruments and hour meter with large non-destructive installation LCD display. Suitable for any 2-stroke or 4-stroke gasoline cart engines in the 15,000 + RPM range. 【Reset Function at Zero Hour】This upgraded digital chainsaw tach meter with reset function, which can reset total hours and maintenance time. The hour meter reads up to 10000 hours, then returns to zero, the tachometer can read up to 99,999 RPM. 【Easy to Use 】This Tachometer tach gauge is equipped with clip, just use the provided clip to clip the spark wire. Body-inductive design, the cable can be operated by the bundle of spark plugs. 【Excellent Design Mode】This tiny tach tachometer and engine hour meter is easy to install and use, which gets the job done with minimal complication. Use the Mode buttons to select the motor type, use the service icon to configure programmable maintenance time to remind you when to change oil or other services. 【Wide Applications】This Tachometer 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.