Quickly measure cylinder compression to accurately diagnose engine conditions Designed to diagnose various common engine faults such as worn piston rings, cylinder head cracks, burnt or leaking valves, faulty head gaskets and etc. Shock protected and easy-reading 2-1/2″ diameter pressure gauge with dual color graduation 0 – 300 PSI / 0 – 21 kg/cm² Gauge with push-button pressure release valve allows repeated testing without disconnecting Equipped with high performance and corrosion resistant brass adapters Suitable for petrol engines on most cars, motorcycles, trucks, ATVs and etc. Kit includes one large pressure gauge with quick coupler, five spark plug adapters for most vehicles (M10x1.0, M12x1.25, M14x1.25, M16x1.5, M18x1.5), two 7″ heavy-duty aluminum extension tubes with universal rubber-cone adapters (straight & angled) and one 18″ long flexible rubber extension hose