Check the listing for details. Multi-Function Cylinder Leak Down Tester Gasoline Engine Compression Gauge Test. Condition: New. Listed at 34.98 USD. Features: 1. Designed to detect a variety of common engine faults such as worn piston rings, cylinder head cracks, worn valves and blown head gaskets. 2. It checks the amount of leakage in an engine cylinder and helps determine the source. 3. Designed to check the amount of leakage in 4-stroke engines. 4. Deal for testing trucks and car models where clearance is minimal. 5. Fit for all local and imported cars and trucks. 6. Judge the leakage according to comparing the normal cylinder pressure of the engine with the measured pressure during the test. 7. Dual gauge leak detection head with quick coupling & pressure release button, manometer with two test.