A refractometer is ideal for seawater analysis and uses the measurement of the refractive index to determine the salinity of natural and artificial seawater, ocean water, or brackish intermediates. The refractive index and temperature are measured and converted into one of three popular measurement units: Practical Salinity Units (PSU), parts per thousand (ppt), or specific gravity (S.G.(20/20)). All conversion algorithms are based upon respected scientific publications using the physical properties of seawater.

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