【Practical Diagnostic Tool】: This inline spark plug tester can not only quickly and easily determine if the spark plug is faulty, but also diagnose outboard engine problems or fuel delivery system malfunctions in order to help you locate the problem and improve repair efficiency.
【Light Indication】: You can visualize the test results through the indicator lights. When the ignition is normal, the indicator light will emit a strong white light. If the spark plug is faulty, the color of the indicator light will be dim and flashing abnormally.
【Premium Material】: Our products are made of high-quality plastic casing with impact resistance and durability to ensure that it is not easy to be damaged in long-term use. The internal wires are made of pure copper, providing excellent conductivity and high-voltage current tolerance to ensure test accuracy.
【Steps for Use】: First of all, remove the spark plug wires after the engine is turned off. Then, connect the black connector to the spark plug. Next, insert the metal end of the tester into the spark plug wire. Finally, try to start the engine and the bulb will flash if the ignition circuit is complete.
【Wide Range of Applications】: The inline spark plug tester is suitable for a variety of internal and external engines and is an indispensable diagnostic tool for vehicle engines. It is widely used in cars, trucks, motorcycles, lawn mowers, snow blowers, trimmers, generators and so on.