RHS-28  (0-28% Salinity)

The RHS-28 is a salt concentration refractometer with a special scale. It can be used for controlling the saltwater concentration when preparing pickles, measuring the concentration of saltwater used in rinsing sea products or in cooking, or for seawater checks.

零点校准：用20°C的蒸馏水在20°C的环境中校准。