Red Sea High-Accuracy Seawater Refractometer

Description

High-Accuracy Seawater Refractometer from Red Sea

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) 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.

Salinity is a general term describing the concentration of salt in water.
However, solutions of different type of salts have different refractive indexes.
Brine is a solution of Sodium Chloride (table salt) that contains 2 chemical elements.
Seawater contains approximately 70 chemical elements that include Calcium, Magnesium, Potassium etc. in addition to the Sodium Chloride.
Seawater and Brine of the same salinity (i.e. the same weight of salt/liter) have different refractive indexes and will give different salinity readings if measured on the same refractometer.

All transparent materials such as liquids refract (distort) light.
All transparent materials refract light differently and have what is called a “refractive index” which means how much a particular material distorts light.
Different concentrations of the same liquid have different refractive indexes.
The scale of a refractometer is calculated by using a mathematical algorithm that relates the measured refraction to its concentration for a specific liquid.

Features:
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 seawater (NSW) at 25°C / 77°F, the normal temperature range for reef aquariums (most standard refractometers are calibrated at of 15°C / 59°F )
Easier to read, higher resolution display, focussed to the relevant range for reef aquariums of up to 40ppt
Includes Integrated Automatic Temperature Compensation (ATC) for accurate measurement at standard ambient temperature