Source: wikibot/hot-filament-ionization-gauge
= Hot-filament ionization gauge
{wiki=Hot-filament_ionization_gauge}
A hot-filament ionization gauge (HFIG) is a type of vacuum gauge used to measure low pressures, typically in the range of 10^-3 to 10^-9 torr (or mbar). It operates based on the principle of ionization created by a hot filament, which serves as the electron source.