Cylinder Compression Tester Test Kit Professional Mechanics Gas Engine Use this kit to check valves and rings, inspect For carbon buildup and late timing. It includes adapters For a wide number of vehicles (spark plug types/depths). Kit includes: 2 rubber cones ends For quick check (no need to thread into head) 3" Gauge has dual color scale with 0-300 PSI, 0-20 kPa Gauge will hold pressure values and has quick push button release valve Fittings: M10, M12, M14, M18 (Male, With "O" Ring) Includes 14mm and 18mm spark plug adapters Includes use manual with technical support Comes with 1/2" diameter x 14" extension hose, straight and angled fittings, rubberized gauge protector and a blow mold case. This Item May have Lubricant Oil Residue From Machining