【Wide Application】: The online spark plug tester is an indispensable diagnostic tool for all engines with spark plugs. It is suitable for all internal and external combustion engines, cars, trucks, motorcycles, lawnmowers, chainsaws, trimmers, snow blowers, generators, etc. The spark plug tester is applicable for all household, business, mechanic, industrial, and commercial users who use spark plugs in engines.

【Premium Material】: The probe of this spark tester is made of a high-quality plated shaft, the optical housing is made of environmentally friendly acetate plastic, and the straight sheath and cable are made of rubber. The high-quality materials are rust and corrosion-resistant, even in high and low-temperature environments.

【Easy to Use】: Easily determine which cylinder is malfunctioning with this product; Simply connect the spark plug tester between the spark plug and the spark plug wire, then start the engine. If sparks are present, the online spark tester will indicate the spark by lighting up. If you are checking a starting problem, ask a friend to crank the engine so you can observe the presence of a spark. 【Light Indication】: The spark plug ignition test kit is equipped with a high-intensity neon light inside, making it easy to see if the ignition wires are intact by flashing. With this indicator light, the spark plug tester can help determine which cylinder is causing the problem and locate the exact cause.