This digital compression teste displays in PSIBARKPA 0300 psi & is complete with M10M12M14 long reach adaptors The flexi hose is fitted with a dual M14M18 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