Fuction: Petrol engine compression tester kits are used to quickly and accurately test cylinder pressure in gasoline engines Features: Meter readings can help diagnose problems such as stuck valves, carbon buildup, cracked cylinder heads or defective main washers, poorly installed or worn piston rings, and burned or damaged pistons Package: Includes 1 piece spring buckle pressure gauge; 5 pieces adapter M10, M12, M14, M16, M18, 200 mm metal extension connector;2 pieces 50 mm metal aluminum rod straight bend rod,1 piece extension hose Applications: With rotary and push-in adapters of different sizes, it is widely used in most gasoline cylinders and deep spark plugs, often used in motorcycles, lawn mowers, cars, trucks, ATV, etc. Not suitable for diesel engines Stability: Dual pressure unit up to 300 PSI or 20 BAR, easy to read large dial, acrylic glass cover, rubber cover, excellent shock absorption. Built in check valve with pressure retaining function ensures maximum pressure at spark plug during compression