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The engine ignition tester probe is the ideal diagnostic tool for engines with spark plugs, allowing for quick and easy diagnosis of outboard motor problems or fuel system malfunctions. It's a must-have for any personal, professional, or automotive machine shop. Turn off the engine and remove the spark plug coil. Connect the black plastic leather connector of the spark plug tester to the spark plug. Connect the metal end of the spark plug tester to the spark plug coil. Start the engine. If the light flashes, the ignition wire is intact. Size: 6 1/4" shield/cable, 5" shaft/light cover. The shaft is nickel-plated, the internal bulb lasts for years, and the clear housing is replaceable. Wide range of uses: for basic troubleshooting of all internal combustion engines, cars, trucks, motorcycles, lawnmowers, chainsaws, brush cutters, snow blowers, generators, etc.