The Matco Tools Cylinder Leakage Tester Kit, No. CLT200, allows users to quickly and efficiently measure cylinder pressure loss. One gauge on the tester measures the pressure of air entering the cylinder, and the other measures the percentage of air leaking from the cylinder. The percentage of air loss indicates the condition of the cylinder and overall condition of the engine. The Matco Tools CLT200 can diagnose internal engine problems such as bad rings, valves and leaking head gaskets. Features and benefits of the kit include dual 2-1/2" gauges, a long flex 24" 14 mm hose and more.