9-piece compression tester set with spark plug tester, QUNNIE compression tester, compression test for motorcycles, cars, outboard motors, chainsaws, snowmobiles, and gas engines

【You Might Be More Satisfied with Just One Instrument】 The dial is quite large, the pressure relief valve makes measurement easy, and the hose with adapters for various connectors provides added convenience. It comes with numerous accessories for all the sizes you need. The gauge is easy to read and maintains pressure until reset with the push of a button. 【Wide Application】 The kit includes various adapters for different hole diameters. The gauge is analog and features a quick-release mechanism that operates smoothly and snaps easily into the hose. It can be used to find the OT (Overhead Turnout) on cylinder #1 for head gasket work. The kit also includes a spark plug tester. This diagnostic tool is used to diagnose ignition or outboard motor problems, as well as fuel system faults. It fits any engine with spark plugs. 【Perfect Replacement】Several other accessories are included to work with most thread sizes, and there are two quick-deploy rubber adapters to hold it in place while starting the engine. For 4- and 6-cylinder inline engines, it makes a quick test easy. 【Great Package】Comes in a nice rubber case to protect it from inevitable drops and bumps. The numerous spark plug hole adapters are all equipped with O-rings for a good seal. 【An Essential Tool】This is a must-have for determining the overall condition of the engine and seeing if anything is causing problems while the car is running. If you have low compression, your car won't start or run properly. Misfires can also cause the engine to stall, in which case you can use a plug-in engine ignition tester. When a spark is ignited, the spark plug ignition tester reflects the spark and lights up, allowing you to diagnose faults such as dirty spark plugs, poor spark plug connections, damaged cables, fault points, etc.