Shop Nilight Compression Tester, 11 PCS Engine Compression Tester Kit with Spark Plug Tester, Automotive Cylinder Pressure Gauge Tool Set for Gasoline Engines in high quality. Accurate easy readings gauge up to 300 PSI/20BAR with different sizes rotary and push on connectors, quick installation with M10, M12, M14, M16, M18 adapters for wide applications. The extra spark tester helps check the condition of the ignition system quickly.