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Features:Double gauge system2-1/2′ input pressure gaugeSnap-on quick connect male connectorGauge scale 0-100PSISpark plug adapters: 10mm, 12mmAir regulatorIncludes carry caseDesigned to detect a variety of common engine faults such as worn piston rings, cylinder head cracks, worn valves and blown head gaskets. It checks the amount of leakage in an engine cylinder and helps determine the source.Gauge scale displays percentage of cylinder leakage and cylinder pressure. Pressurized air is supplied to each cylinder and in moments displays a rate of leakage measure from 0 to 100%Suits all local and imported cars and trucks, designed to check the amount of leakage in 4-stroke engines. Ideal for testing trucks and car models where clearance is minimal.