? Durable, high-quality 2" diameter compound vacuum/pressure gauge with accurate gearless diaphragm movement and protective rubber boot. Special stem design allows convenient 360ø rotation and easy pin-release removal. Replaces original gauge on all Mityvac Silverline Elite and Selectline models, or additional option for pumps purchased without gauge. Includes locking pin. Indicates 0-30 psi (0-200 kPa) pressure and 0-30 inches of Mercury (0-100 kPa) vacuum. ? Weight: 6.1 oz. (173 g) ? Size: 2 3/4" x 1 1/2" x 3 1/2"