Red Sea Seawater Salinity RefractometerRed Sea’s Seawater Refractometer offers exceptional accuracy, for measuring the absolute salinity of seawater at a temperature of 25 C /77 F.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 15oC/59 0F rather than 25oC/77 0F. Thus, a measurement deviation of up to 1.5ppt is possible, which can have a significant adverse effect on coral growth and coloration.Comes with full instructions Recommended levels:Marine Tanks 1.023 -1.026 Brackish WaterLow salinity brackish water for things like Puffers and Knight Gobies 1.005 at 25 Celsius Medium salinity brackish water for things like Scats and Monos 1.010 at 25 Celsius
