Part number:1 Item Weight:81 g Package Dimensions:19.3 x 10.5 x 2.5 cm 81 g Colour:Black, Clear Style:Tool Material:Nickel,Rubber Power source type:Ignition Item Package Quantity:1 Batteries included :No Batteries Required :No Step 1: Off the engine and remove rubber boot from 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: The indicator light flashes if the ignition cable is intact. Fault DetectorEngine Spark Tester is a necessary diagnostic tool for any engine with a spark plug, which can quickly and easily diagnose ignition or engine motor issues or a fault of the fuel delivery system. Easy To UseRemove rubber boot from spark plug, insert tester and place tester boot on plug By just connecting the tester between the plug wire and the spark plug, if a spark is being sent, the tester will mirror the spark and light up. If not, problems may be the dirty spark plugs, defective points, bad cables or connections, etc. Light IndicatorEssential for trouble shooting all internal combustion engines. Indicator light flashes when ignition circuit is complete. The light indicator shows the color of the spark very clearly so you can identify a weak pack. Great DesignThis automotive coil tester is nickel plated shaft, Double ended flexible tool with internal bulb lasts for years, and is replaceable through transparent housing. Versatile For Widely ApplicationThis Ignition Spark Tester works with all devices that have a spark plug and is essential troubleshooting for all internal and external combustion engines, such as cars, trucks, motorcycles, lawnmowers, chainsaws, trimmers, snow-blowers, generators, etc. Fault DetectorEngine Spark Tester is a necessary diagnostic tool for any engine with a spark plug, which can quickly and easily diagnose ignition or engine motor issues or a fault of the fuel delivery system. Easy To UseRemove rubber boot from spark plug, insert tester and place tester boot on plug By just connecting the tester between the plug wire and the spark plug, if a spark is being sent, the tester will mirror the spark and light up. If not, problems may be the dirty spark plugs, defective points, bad cables or connections, etc. Light IndicatorEssential for trouble shooting all internal combustion engines. Indicator light flashes when ignition circuit is complete. The light indicator shows the color of the spark very clearly so you can identify a weak pack. Great DesignThis automotive coil tester is nickel plated shaft, Double ended flexible tool with internal bulb lasts for years, and is replaceable through transparent housing. Versatile For Widely ApplicationThis Ignition Spark Tester works with all devices that have a spark plug and is essential troubleshooting for all internal and external combustion engines, such as cars, trucks, motorcycles, lawnmowers, chainsaws, trimmers, snow-blowers, generators, etc. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.