A vacuum gauge reads pressure in _______

A vacuum gauge typically reads pressure in microns of mercury (also written as "microns Hg" or "mmHg"), which is a unit of pressure measurement commonly used in vacuum technology. Other units of pressure measurement that may be used for vacuum measurements include torr and pascal (Pa). Inches of mercury (inHg) is a unit of pressure measurement commonly used for atmospheric pressure measurements, but it can also be used to measure vacuum pressures. Psia and psig are units of pressure measurement commonly used in the context of gas pressure, but they are not typically used to measure vacuum pressures.