Spark Plug Tester: The engine ignition tester is essential for any engine with spark plugs and can quickly and easily diagnose ignition/outboard engine problems or fuel system failures. Function: The spark plug tester provides quick diagnostic support for all ignition system problem tests. Unique design: Transparent viewing window design, convenient for observing the spark and confirming if it is normal, and easy to use. Easy to use: Intuitive and convenient for understanding the function of the ignition coil. Helps determine coil voltages. Prevents high-energy arcing directly at any stage. Application: Ignition tester. Works with all vehicles equipped with spark plugs, even small cars; cars, motorcycles, lawn mowers, boat engines, chainsaws, small and large indoor and outdoor engines and more. Product description: Adjustable automatic electric coil tester Ignition system diagnostic tool. Functionality: Simply connect the spark plug and spark plug cable, and the screw assembly allows for quick and easy adjustment of the spark gap. It can quickly and easily diagnose whether the car's ignition system is working correctly. Prevent fires, ignition coil burns, etc. A normal spark plug cable is blue-violet with a straight line two centimeters long. If it is red or bent, it means the ignition coil is defective. Suitable for all internal combustion engines, cars, trucks, motorcycles, lawn mowers, chainsaws, trimmers, snow blowers, generators, etc. Specifications: Product name: Ignition tester Color: Black Material: ABS + Metal Distance: Approx. 0.8-1.5 cm Length: Approx. 140 cm Package included: 1 x Ignition tester Note: Transition: 1 cm = 10 mm = 0.39 inches. 1. Due to differences in lighting and screen settings, the item's color may differ slightly from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.