$49.99 Red Sea Seawater Salinity Refractometer

High Accuracy Seawater Refractometer!Red Sea’s Seawater Refractometer offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25°C/77°F. This is a REFURBISHED unit, but it is a great shape and ready to work for you! Most refractometers used within the aquarium hobby are not specifically designed for reef aquariums and use an algorithm for the measurement of brine (NaCl – rather than seawater) and at a temperature of 15°C/59°F rather than 25°C/77°F. Thus, a measurement deviation of up to 1.5ppt is possible, which can have a significant adverse effect on coral growth and coloration.Main features of Red Sea’s Seawater Refractometer include: Directly reads the absolute salinity of seawater at 25°C/77°F ( No need for seawater or temperature compensation factors) Specifically designed for the ionic content of seawater (NSW) for more accurate salinity measurement (industry standard refractometers are calibrated for salt brine ). Calibrated for seawat