Pressure gauges are instruments used to measure pressure. A pressure gauge is used to measure pressure in a vacuum. Pressure gauges include test gauges, process gauges, industrial gauges, sanitary gauges and commercial gauges. A pressure gauge is a common operations component in various industries. Pressure gauges with bourdon tubes are the most common pressure measuring devices. Pressure gauges are crucial components of most processing systems. Pressure gauges must be reliable, accurate and easy to read to help prevent failure in everyday operations. Bourdon gauges are used in refineries and petrochemical processing, to hydraulic and pneumatic installations. Pressure gauges are used in energy industries and exploration wells.