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Heavy-duty compression test kit detects worn piston rings and cylinders, damaged valves and blown head gaskets. Simply test compression by threading the appropriate hose and adapter into spark plug hole. Impact-resistant gauge measures up to 300 PSI. Includes 4 hoses and 4 adapters to fit any engine High-impact 2 3/4in. gauge measures 0-300 PSI Shock-resistant gauge reads in PSI, kg/cm2 and Bar scales Pressure release valve Air hold adapter Quick-release coupling Includes 4 extension hoses: 6 1/2in./14mm short reach hose 12in./14mm short reach hose 12in./14mm long reach hose 12in./18mm short reach hose Adapters include: 10mm small engine adapter 12mm small engine adapter 14mm female long reach adapter 18mm male long reach adapter Air hold adapter quick connector for valve seal service Includes field service kit with 9 seals 5 Schrader valves and core removal tool