Spark Plug Tester - This automotive diagnostic tool allows you to validate the presence of ignition and therefore identify a fault. Thanks to the spark plug tester, this allows you to have a visual inspection Quality Material - Made of nikel plated, equipped with pure copper wire inside, subjected to a high voltage current test. Everything is designed for a long life High Efficiency - Ignition tester that saves a lot of time to check the efficiency of an ignition system without having to remove the spark plug. It is a useful tool for anyone who does DIY work or manages a fleet of equipment The test shows that the normal spark plug is &#34;purple blue, straight line of two centimeters long, if it is red or bent it means the ignition coil is bad Works with all vehicles that have a spark plug 39;s ignition, even small car engines; car, motorcycle, lawn mower, boat engine, chainsaw, small and large internal/external engines and more Spark Plug Tester< /b> Essential for troubleshooting all internal combustion engines. To clearly visualize the operation of the ignition system. Effective for detect faulty ignition harnesses and easily analyze any starting problems. Operation Steps Step 1: Stop the engine and remove the rubber boot from the spark plug.Step 2: Connect the black connector of the tester to the spark plug.Step 3: Connect the metal end of the tester to the spark plug coil.Step 4: Start the engine.Step 5: Indicator light flashes when the circuit works Specification: Product name: ignition tester < p>Material: ABS + metal Color: black Length: about 150 mm Contents: 1 ignition tester.