Bourdon tube
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Bourdon tubes are a popular pressure gauge used to measure the gauge pressure of liquids and gases. Gauge pressure is the pressure of a fluid media relative to the atmospheric pressure. Bourdon tube pressure gauges are mechanical. They do not use an electrical signal to work. They measure fluid pressure within the range of 0.6 to 7,000 bar or 8 to 1,000 pounds per square inch (psi). Since this pressure gauge can be used for low-pressure, vacuum and high-pressure applications, it is common in most industries.