Magnetron Gauge

a vacuum gauge similar in structure to a magnetron. There are two types, ionization gauges (Lafferty manometers) and discharge gauges. The measurement range of the ionization type is 10^-5 to 10^-11 newton per sq m (N/m²), or 10^-7 to 10 millimeter of mercury (mm Hg; the range of the discharge types is 10² to 10^-9 N/m²(10⁴to 10^-11 mm Hg).