Made of plastic, with good toughness, hardness, and balanced mechanical properties, it has low temperature impact resistance, and high-quality products provide you with a high-quality guarantee. Size: 20*11*2.5 cm The grounding clamp is firmly held and has a rubber sleeve for easy use. The transparent observation window makes it easy to observe the flashover situation and confirm whether it is normal and easy to use. Pre-tested, high-quality, accurate aftermarket spark plug engine ignition tester. Basic troubleshooting for all internal and external combustion engines, cars, trucks, motorcycles, generators, etc. The spark tester can be connected between the spark plug and the spark plug wire in seconds to solve the ignition connection problem. Connect dirty points and faulty spark plug cables in seconds