How can you use an EC meter to measure ocean salinity?

Conductivity measurements can be used for determining salinity as it relates to general oceanographic use.

Three measurement scales are in use and depending on the sophistication of the meter, are available for salinity measurement in Seawater. The 3 scales are Practical Salinity Scale (PSU); 1978, Percent Scale (%); and Natural Seawater Scale (g/L); 1966. Practical Salinity and the Natural Seawater require a conductivity calibration. The meters have the algorithms to convert the measurement to the desired scale. NaCl % requires a calibration in standard. Portable meters with this measurement make it easy to measure salinity in saltwater aquariums and brackish waters.