Check your vehicle s compression with the Innova 3612 four-piece Compression Tester Kit for Engines by Equus. This cylinder compression tester features a 2.5 dial face with dual-calibrated and easy-to-read color-coded scales. It also features a 15 high-pressure rubber hose with 14mm and 18mm adapters. Other features include a heavy-duty Bourdon tube meter movement and a side-release valve. The side-release valve allows you to run repeated compression tests without having to disconnect. You can also use the quick disconnect fitting for easy installation. The Innova compression tester includes 12mm and 14mm adapters so you can run compression tests on ATVs motorcycles snowmobiles and watercraft. You can also use the 14mm adapter for long-reach spark plug applications. All adapters feature stainless steel casing to prevent corrosion. The snap-on compression tester is small enough for you to keep in the trunk of your vehicle so you can always be prepared for emergency situations.