This professional engine cylinder compression tester kit features a dual mechanical gauge (0-100 psi pressure gauge and leak-rate gauge). By comparing the input pressure with the pressure inside the cylinder, it directly calculates and displays the leakage percentage. It includes multiple fittings, universal air fittings, and a portable storage case, making it a reliable tool for diagnosing cylinder sealing performance. | Vevor | | Engine Cylinder Compression Tester Kit, Pressure Gauge Range of 0-100 PSI, Automotive Leak Down Tester Kit | Black,Orange | Black/Orange | Best Buy