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The Waterbox Refractometer is designed for testing the concentration of salt water. Its triple scale provides a direct reading of the specific gravity and concentration (Parts per Thousand) of salt in water. It provides reliable refractive index and salinity readings of total dissolved solids of aqueous solutions.
The Waterbox Aquariums®
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Waterbox refractometer
The refractometer is very easy to use, of good quality and well marked as you look through the optical. The only thing I did not like was that it comes in a cardboard case and I would much rather have had plastic for durability. I would purchase again if I needed one.