1Wide Application: Engine compression tester gauges set is suitable for any gasoline engine with 14mm 12mm or 10mm spark plugs, checks the amount of leakage in an engine cylinder and helps determine the source. 2Universal Fit: Suits all local and imported cars and trucks, ideal for testing trucks and car models where clearance is minimal to check the amount of leakage in 4 stroke engines. 3Powerful Function: Designed to detect a variety of common engine faults such as worn piston rings, cylinder head cracks, worn valves and blown head gaskets. 4Dual Gauge: Engine cylinder leak tester kit contains twin gauge, which shows cylinder leakage and cylinder pressure (0?100psi, 0?7bar). 5Efficient Working: Precise manufacturing, engine compression tester kit is used for measuring pressure on gasoline engine cylinder quickly and accurately.