Pressure measurement
（重定向自Vacuum gauge）
![The construction of a bourdon tube gauge. Construction elements are made of brass.](/Images/godic/202502/19/Manometer_inside3030.jpg")
![](/Images/godic/202502/19/Utube3030.PNG")
![A McLeod gauge, drained of mercury](/Images/godic/202502/19/McLeod_gauge3030.jpg")
![Membrane-type manometer](/Images/godic/202502/19/Manometer_1040263030.jpg")
Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges.
A manometer is an instrument that uses a column of liquid to measure pressure, although the term is currently often used to mean any pressure measuring instrument.