Ignition Spark Tester: An engine spark tester is essential for any engine equipped with spark plugs to quickly and easily diagnose ignition problems. Ignition Fault / Outboard Engine or Fuel System Function: The spark plug tester provides rapid diagnostic assistance for all ignition system problem testing. Unique design: Transparent window design, easy to observe the beat situation and confirm whether it is normal, and easy to operate. Easy to use: You can intuitively and easily understand the operation of the igniter. Helps determine coil voltage Prevents high energy arcs directly on any stage. Application: Ignition Tester For all vehicles with spark plugs, even small cars; cars, motorcycles, lawn mowers, marine engines, chainsaws, small and large indoor and outdoor engines, etc. Again. Product Description Ignition Tester Coil Ignition System Diagnostic Test Tool adjustable automotive electric coil Function: Simply connect the spark plug and spark plug wire, the screw set for quick and easy spark gap adjustment. It quickly and easily diagnoses if your car's ignition system is working properly. Avoid fires, ignition coil burns, etc. The normal spark plug is purple blue and the straight line is two centimeters long. If it is red or bent, it means the ignition coil is faulty. Compatible with all internal combustion engines, cars, trucks, motorcycles, lawn mowers, chainsaws, trimmers, snow blowers, generators and more. Features: Product Name: Ignition Tester Color is Black< /p> Hardware: ABS+Metal Distance: about 0.8-1.5cm Length: about 14cm Package contains : 1 x Ignition Tester Note: Transition: 1cm=10mm=0.39inch. 1. Due to the light and screen difference, the item's color may be slightly different from the picture. 2. Due to manual measurement, please allow 0.5-2cm differences.