Durable, high-quality compound vacuum/pressure gauge with accurate gearless diaphragm movement. Special stem design allows convenient 360° rotation and easy pin-release removal. Replaces original gauge on all Mityvac Selectline dual vacuum/pressure models. Includes locking pin. Indicates 0-30 psi (0-200 kPa) pressure and 0-30 inches of Mercury (0-100 kPa) vacuum.