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A complete test kit to check valves and rings, perform carbon build up inspection and test for late timing on a wide number of vehicles. Gauge with rubberized protector and dual color scale, tests up to 0-300 PSI and 0-20 kPa. Blow mold case included for easy storage. Test from your own garage. Compatible with gasoline engines. Spark plug thread adapter sizes: M10 x 1.0, M12 x 1.25, M14 x 1.25, M18 x 1.5 (adapters cover every 99% of all engines, domestic and imports) Includes: 6 Adapters Extension hose Straight and angles fittings Operating Instructions