Product name: Digital tachometer Product features: 1. Top quality instruments with large LCD display. 2. Waterproof, easy to install. 3. Widely used in dirt bikes, go-karts, all-terrain vehicles, two-stroke chainsaws or lawn mower engines. 4. Due to the inductive construction, the rotational speed can only be measured by bringing the ignition cable closer to the engine. A variety of measuring methods: Hold the meter between the spark plug cable 3-5cm with hand and carry out the test; After one end of the electronic cable is installed in the opening of the electronic watch case, use a metal clip to tighten the spark plug cable jacket for inductive measurement. Wide application range, suitable for motors with speed range above 25,000 rpm. Suitable for any 2-stroke or 4-stroke gasoline engine. Easy to install, use inductive design, install the spark plug for smooth operation. Widely used in dirt bikes, go-karts, all-terrain vehicles, two-stroke chainsaws or lawn mower engines. Auto Zero Hour Reset Function - Hour Meter operating time up to 10,000 hours - Return to zero - Speedometer can display up to 99,999 rpm. Easy to use. When the engine is turned on, the current speed is displayed. When the engine is off, all operating hours are displayed. Use the service icon to set up programmable maintenance times to remind you when to change oil or other services.