Best used when comparing a suspect cylinder to a know-good cylinder on same engine.<br />Ideal for testing trucks & late-model cars where clearance is minimal.<br />Equipped with 2-1/2"input pressure gauge for proper leakage test setup and accurate results.<br />Designed to detect various common engine faults including worn piston rings, worn valves, cylinder head cracks, and blown head gaskets.<br />Suitable for use on any petrol engine with 10, 12 or 14mm spark plugs.