Hand-Held Refractometer For Salinity The RHS series are designed for testing the concentration of salt water and brine. Its triple scale provides a direct reading of the specific gravity and concentration (Parts per Thousand)of salt in water and The RHS-10 proves itself invaluable for agriculture.food processing and wildlife management. This instrument is equipped with Automatic Compensation making it ideal for field use. Product Specification Model Range Min.Div. Accuracy Remark RHS-10 Salinity: 0-100% Specific gravity: 1.000-1.070 Salinity: 1% Specific gravity: 0.001 ?% Specific gravity: ?.001 Without Atc RHS-10ATC Salinity: 0-100% Specific gravity: 1.000-1.070 Salinity: 1% Specific gravity: 0.001 Salinity: ?.001 Specific gravity: ?.001 Atc RHS-28 Salinity: 0-28% Salinity: 0.2% Salinity: ?.2% Without Atc RHS-28ATC Salinity: 0-28% Salinity: 0.2% Salinity: ?.2% Atc