Oceanlife Water Salinity Converter
This software allows you to convert basic marine water data between different units of measurement. The data is calculated at the surface.
(usually it is equal to the temperature of the sea water)
PSU (g/kg - ppt - ‰)
g/l (value read on the densimeter) (?)
(value read on the refractometer) (?)
mS/cm (value read on the conductivity meter)
Source - oceanlife.it https://www.oceanlife.it/index.php/en/19-notizie/370-water-salinity-converter-en