Product Name: Digital Tachometer Product Features: 1. High quality instruments with large LCD display. 2. Waterproof, easy to install. 3. Widely used in off-road motorcycles, karts, all-terrain vehicles, two-stroke chainsaws or lawn mower engines. 4. Due to the inductive construction, the rotation speed can only be measured by bringing the ignition cable close to the engine. A variety of measurement methods: Hold the meter between the spark plug cable 3-5 cm with your hand and perform the test; after one end of the electronic cable is installed in the opening of the electronic watch case, use a metal clip to clamp the spark plug cable sheath for inductive measurement. Wide range of applications, suitable for engines with a 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 good operation. Widely used in dirt bikes, karts, all-terrain vehicles, two-stroke chainsaws or lawn mower engines. Automatic zero-hour reset function - Operating hours meter 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 turned off, all operating hours are displayed. Use the service icon to set programmable maintenance times to remind you when to change the oil or other services.