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Salinity measurement instruments

The oceanographic parameter of Salinity is a measure of the concentration of salts in a water sample. Its uses include characterising the origin of a particular body of water for ocean circulation studies, allowing the study of the fluctuating tidal boundary between fresh and saline waters in an estuary, and as one of the parameters required to calculate the speed of sound in water. The region in the water column where the salinity value changes most rapidly with depth is known as the Halocline.