This digital compression test displays in PSI/BAR/KPA (0-300 psi) & is complete with M10/M12/M14 long reach adaptors. The flexi hose is fitted with a dual M14/M18 adaptor & features a quick fit connector to the gauge plus one straight & one cranked adaptor with push on fittings. This product can be used on a wide variety of petrol engines & can be used to detect warn piston rings, burnt valves & blown head gaskets. The set complete with spare washers.