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Engine Cylinder Compression auto Tester Kit gauge M8 M10 M12 M14 Gas motor 90376 This Item Features: -Quickly and accureately check compression on petrol engine -Quickly diagnose worn piston rings, burnt valves and bad head gaskets -Professional quality, works on most domestic and foreign engines -Completed kit comes with adapters for most applications -Check the condition of your piston ring & valve seats -3" gauge features dual color scale. (0-300 PSI, 0-20 kPa) -4 Spark plug thread adapter: (M8 x 1.5, M10 x 1.0, M12 x 1.25, M14 x 1.25) -400mm flexible extension -2 Pc rubber cones ends for quick check (No need to thread into head) -Blow mold case included