The OTC Digital Compression Tester Kit, No. 5606-DG, is designed to help determine the mechanical condition of the engines' cylinders. The digital gauge is easy to read and can display pressures in psi, kPA, bar, and kg/c. It also can measure, record and playback compression readings on up to 12 cylinders for quick testing and diagnosis. Specialized adapters work on both flat and tapered seat plugs. A convenient push-button side release valve relieves pressure for repeat testing. The kit includes standard and specialty adapters and is stored in a blow molded case. Works on gasoline engines including domestic, import, motorcycle, marine, snowmobile, ATV's, and small engines.