Cheque your vehicle's compression with the 3612 Innova Engine Compression Tester by Equus. This cylinder compression tester features a 2-1/2" dial face with dual-calibrated and easy-to-read colour-coded scales. It also features a 15" high-pressure rubber hose with 14mm and 18mm adapters. Other features include a heavy-duty Bourdon tube metre movement and a side-release valve. The side release valve allows you to run repeated compression tests without having to disconnect; however, you can use the quick disconnect fitting for easy installation. The included 12mm and 14mm adapters allow you to 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 that you can keep it in the trunk of your vehicle, so you are always prepared for emergency situations.