Inline Spark Plug Tester, Automotive Engine Ignition Spark Plug Light Checker, Straight Boot Tool, Small Armature Diagnostic Detector Tool for Cars Lawnmower MotorcyclesColor: 1 PCAbout this item 【Durable】: This spark tester probe is made of high-quality plastic with high hardness. The interior is made of pure copper wire, which can withstand high voltage current. The spark plug type metal head is easy to connect, wear-resistant, and durable. It features a built-in card core for easy use. The internal bulb has a long service life and will not heat up after prolonged use. 【Light Indication】: This spark plug engine ignition test features a high-intensity light bulb, making it easy to tell if the ignition wires are intact by the brightness and flashing of the bulb. If there are no issues with the ignition wire, the light will glow. The bulb lasts a long time and does not get hot easily. 【Easy Operation】: It is very simple to use; just turn off the engine and remove the spark plug coil. Connect the black leather connector of the spark plug tester to the spark plug, connect the metal end of this spark plug tester to the spark plug coil, and start the engine. If the light comes on, the ignition wire is normal. 【Wide Application】: This automotive spark tester is suitable for any engine with spark plugs for home, business, machinery, and industry. It can be used for all internal combustion engines, including automobiles, trucks, motorcycles, lawn mowers, chain saws, trimmers, snowblowers, generator engines, and more. 【Size】: The spark tester measures 4 x 2 x 1 inches, allowing you to check sparks even in hard-to-reach areas. Ignition misfires can cause your engine to lose power, and this spark tester can quickly and easily diagnose ignition and engine problems.