The Innova 3612 Compression Tester has a large easy-to-read 2-½” dial face with dual-calibrated and color-coded scales. Packaged as a 4-piece kit for optimum use options. This diagnostic tool which can help you identify damaged pistons, worn rings, burnt valves, and blown head gaskets. It works on conventional, electronic, and computerized domestic and import vehicles. It features a large 2-1/2-inch dial face with accurate Bourdon tube meter movement, dual-calibrated and color-coded scales which reads 0-300 P.S.I and 0-2100 k.P.a. It has a 15-in high-pressure rubber hose which is oil and grease resistant, a side-release valve which allows repeated tests without disconnecting the hose, and 14mm and 18mm adapters that fit most vehicles. A 12mm adapter is also provided which can be used for most motorcycles, ATV's, snowmobiles and marine applications.