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 -