Features: -This compression tester can be quickly set to your bike / car , then you can get accurate readings in valves , piston rings , cylinder bores or head gaskets . -Manometer with double graduation ( 0 to 300 psi , 0- 21 kg / cm 2 ) and with rubber protection to prevent scratches -Drain valve with full copper nickel plating, anti -oxidation and corrosion - M10 adapter is suitable for motorcycles, M12 M14 M18 adapters are suitable for car. .