Diagnose Misfire Trouble Swiftly : Using inline spark plug tester could help you diagnose ignition and engine problems and defects quickly and easily. A small spark plug tester is the most direct and useful tool to detect problems such as spark plug connections, contact points, cable damage, etc

Indicator light description : The spark plug light checker could help the tester to make further adjustment plans through the indicator light. An Intense bright white light indicates a healthy spark, jumping colors indicate weak contact current, and no light indicates no current passing. Further, help you identify which cylinder is causing the problem and track down the exact cause

Convenient Operation : 1. Shut off the engine and remove the spark plug wire; 2. Connect the black connector to the spark plug; 3. Insert the metal end of the tester into the spark plug wire; 4. Start the engine and observe the indicator light; The time required for all internal combustion engine troubleshooting is approximately 20 seconds

Fabulous Materials : The ignition coil spark plug tester is made from high-quality high-temperature-resistant wire, the transparent shell is designed for clear display, and the inner bulb can be used for many years. Anti-rust and corrosion-resistant, easy to store and prolong service life. Dimensions: 3" (7.6cm) Nickel Plated Shaft; 7" (17.8cm) Rubber Straight Boot and Cable; 1" (2.5cm) Bulb. It's portable that apply for checking hard-to-reach areas for sparks

Wide Applications :Automotive spark tester is suitable for all internal combustion engines, cars, trucks, motorcycles, lawn mowers, chainsaws, trimmers, engines, etc. The coil on plug tester is suitable for any personal, domestic, commercial, mechanical, industrial and other engine spark plug use