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Salinity is the most important measurement of seawater you can make for your tank. Having a proper and stable salinity in a saltwater aquarium lets your little fish live longer. Hydrometers are one of the tools that can measure salinity but they cannot be calibrated. Thus, notorious for being inaccurate.
The best way to measure salinity and specific gravity is to use a refractometer that provides accurate measurements, like this SciFish™ Dual Scale Salinity Refractometer!
Click "ADD TO CART" to experience it for yourself today!