Can perform carbon buildup inspection and retardation testing on a wide range of vehicles with gasoline engines. The auger with rubberized protector and two-color scale, tests up to 0-300 PSI and 0-21kg/cm². Different size adapters for different vehicles. M10 thread suitable for motorcycles, M12/M14/M18 thread suitable for cars. Piston pressure testing is made easy with this excellent compression tester kit. All tools, parts, and accessories can be stored and kept safe in the protective case.