Use this Equus 3614 Innova Compression Tester to make sure your engine is properly functioning. It features a large easy-to-read 2-1/2 dial face with dual-calibrated and color-coded scales. The Equus compression tester also has a 15 high pressure rubber hose with 14mm and 18mm adapters. The side-release valve allows the device to be used for repeated tests without disconnecting the hose. For even more options the vehicle compression tester includes a 10mm and a 12mm adapter for broader applications such as motorcycles ATVs snowmobiles and watercraft. This is a must-have device in a mechanic s garage who is working on different vehicles on a daily basis. You always want to be sure that your automobile is operating at its best. To make sure that nothing is wrong under the hood certain testing is required. You can use this device to perform those tests that will tell you if any further work is required.