Designed to detect common engine faults such as worn piston rings, cylinder head cracks, worn valves, and blown head gaskets. It checks the amount of leakage in an engine cylinder and helps determine the condition of the engine. Suitable for checking the amount of leakage in 4-stroke engines. Ideal for testing trucks and car models where clearance is minimal. Fits all standard cars and trucks. Size: 34 x 26 x 8 cm Spark plug adapter: 12mm, 14mm Gauge scale: 0-100 PSI Color: Red + Black Material: Rubber + Metal Package Content: 1 x Cylinder Leak Tester 1 x Tube 2 x Screw 1 x Storage Box 1 x Manual Note: Light and different displays may cause the color of the item in the picture to appear slightly different from the real thing. The measurement allowed error is +/- 1-3 cm. Only the above package content is included; other products are not included.