most widely used low-pressure (vacuum) measuring device for the region from 10−3 Torr to 10−10 Torr (1 Torr = 133,32 Pa), kõige laialdasemalt kasutatav madalrõhu (vaakum) mõõtevahend rõhuvahemikus alates 10−3 Torr kuni 10−10 Torr (1 Torr = 133,32 Pa), sensitive gauge for very low pressures (also referred to as hard or high vacuum)