Red Sea Seawater Salinity Refractometer
Red 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
Marine Tanks 1.023 -1.026
Low 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