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Depth measurement instruments

Equipment developed, manufactured by Valeport often includes a means of determining the depth (the precise distance between the sensor and the water surface) by measurement of pressure. A highly sensitive crystal is used that changes its electrical properties as pressure varies (this relationship is directly proportional). Depth measurements taken in this way are used as a vertical reference for data acquired by other sensors such as sound velocity, temperature, or chlorophyll a, as well as providing critical navigation information for manned and unmanned submarine vehicles.