The Mastercool 99134-A is a R134a Digital Manifold with Auto Capacity 1/2″ ACME, one of the most advanced and user friendly Digital Manifold on the market today. This manifold offers a large easy to read LCD that displays Pressures, Saturated Temperatures, Actual temperatures, Superheat and Subcooling temperatures for over 60 refrigerants. When used with the Clamp-on Thermocouple connector it will display the actual temperature and automatically calculate the superheat or subcool temperature. When the vacuum sensor cable is attached to the manifold it will display deep vacuum. To insure lasting performance and durability the manifold case is constructed of ABS material and protected by a rugged rubber boot.