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salinity Refractometer This dual scale salinity refractometer is used to measure, monitor and control the concentration of salt water and brine, especially useful for aquarium and marine applications. This high quality refractometer measures on 2 scales, Specific Gravity (D 20/20) and parts per thousand and replaces your poor quality and difficult to read hydrometer. With just a couple of drops of aquarium water you know exactly what your salinity is.The usual salinity of the selected aqueous solutions 1.Fresh water ---< 0.5 ppt 2.Brackish water---0.5 to 30 ppt 3.Saline water (Seawater)---30 to 50 ppt 4.Brine---> 50 ppt Specifications Measuring Range: 0-10% Salinity Division: 0.2% Salinity Accuracy: ±0.2% ATC: 0-10°C Reference Temperature: 20°C Item Length: 17.2 inch Item Weight: 3.5ounces Shipping weight: 9ounces Shipping size: 6.77 x 3.54 x2.36 (inch) Package included: 1 x Salinity Refractometer 1 x Plastic Pipette 1 x Mini Screw Driver 1 x User Manual 1 x Cleaning Cloth 1 x Plastic Box