The INNOVA Compression Tester Plus is a 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 and dual-calibrated and color-coded scales. Includes a 15-inch high-pressure rubber hose with stainless steel casing, side-release valve, 14mm long reach adapter, 14mm and 18mm adapters that fit most vehicles. Also includes 10mm and 12mm adapters which can be used for most motorcycles, ATVs, snowmobiles and marine applications.