Vacuum Gage 1
Vacuum Gage 1 : (Techn) An instrument for measuring subatmospheric pressures, usually expressed in inches of water or millimeters of mercury. Note: Pressures above 1 mm Hg are measured by liquid-column manometers, diaphragms, bellows, and Bourdon gages. Lower pressures are best determined indirectly by measuring thermal conductivity or ionization