Ideal for gasoline engines 4 6 8 cyclinder Checks valve and rings Detects excessive carbon and late timing Includes 2 adapters( M14x 1.25 and M18 x 1.5) to test more vehicle Rubber Cover Protection 2-1/2" diameter gauge with dual-color scale (0-300 PSI & 0-21 BAR) Screws into spark plug hole to test cylinder Compression on internal combustion gasoline engines.
