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A pressure gauge or manometer is a device used to measure pressure, i.e. any pressure gauge in gas or liquid. Special types of pressure gauges may have their own names, e.g. barometer, barograph, aneroid. A barometer is a measure of atmospheric (barometric) pressure. A pressure gauge for measuring pressure in a closed space (e.g. tire, steam boiler) is sometimes referred to as a manometer.

Pressure gauges in practice
In technical practice, pressures in the range from 10-12 to 1012 Pa are most often measured. No sphygmomanometer can measure pressure over this entire range.

Pressure gauges according to purpose
Barometer for measuring air pressure
vacuum gauge for measuring great vacuum
manovacuometer for measuring overpressure and underpressure
differential pressure gauge for measuring the pressure difference, the so-called pressure difference
sphygmomanometer for measuring blood pressure
altimeter, i.e. altimeter for measuring altitude
depth gauge is a hydrostatic pressure gauge, usually portable
aneroid is a pressure gauge of atmospheric pressure, i.e. relative pressure, unlike a barograph, it shows the current state of pressure
barograph is a measuring device of atmospheric pressure, air pressure, which is able to record the course of pressure
Condensing loop
If the pressure gauge is designed to measure water vapor pressure, a condensation loop is used for the supply. It is a simple spiral, or so-called a steam cooling coil in which steam is condensed to water. The condensed water remains at the lowest point of the coil and separates the pressure gauge from the steam, preventing the temperature of the steam from affecting the measurement.

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