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Pressure measurement instruments

Pressure is measured underwater as well as a means of determining the depth of the instrument from the water surface. For static, long term installations such as tide gauges, a strain gauge is typically used – the strain gauge changes its electrical resistance when a force is applied. In more dynamic applications where the sensor package is to be used to measure pressure changes that vary much more rapidly, a highly sensitive crystal is used – again, this changes its electrical resistance with pressure.