Red Sea Seawater Refractometer

Achieve precise and reliable salinity readings with the Red Sea Seawater Refractometer—engineered specifically for reef aquariums. Unlike standard brine-based refractometers, this instrument is calibrated for true seawater at 25°C/77°F, ensuring accurate absolute salinity readings with zero conversion or compensation required. With enhanced resolution, seawater-specific algorithms, and integrated ATC, this refractometer eliminates the 1.5ppt errors common in hobby-grade tools, safeguarding your corals’ growth, health, and coloration.

Key Benefits

• Delivers highly accurate absolute salinity readings

• Prevents the salinity errors that adversely affect coral growth and colour

• No temperature or seawater compensation tables required

• Designed specifically for the ionic composition of natural seawater

• Easy-to-read scale focused on the reef-relevant range up to 40ppt

 

Core Features

• Seawater-Specific Algorithm: Calculates actual seawater refractive index—unlike standard brine refractometers

• Calibrated at 25°C/77°F: Matches the natural temperature of reef aquariums for accurate readings

• Integrated ATC: Automatic Temperature Compensation ensures stable measurements under normal ambient conditions

• High-Resolution Display: Enlarged, easy-to-read PPT scale tailored to reef salinity levels

• No Conversion Needed: Directly displays the true absolute salinity without the 1.0–1.5ppt error of brine-based tools

• Precision Optics: Built for dependable, repeatable performance in marine systems

 

Technical Specifications

• Measurement Type: Absolute salinity (PPT)

• Calibration Temperature: 25°C / 77°F

• Scale Range: 0–40ppt (reef-optimised resolution)

• Algorithm: Calculated for natural seawater (NSW), not brine

• Temperature Compensation: Integrated Automatic Temperature Compensation (ATC)

• Intended Use: Marine and reef aquariums

 

Who is this product for?

• Reef aquarists seeking the most accurate salinity readings

• Hobbyists who want to eliminate errors caused by brine-calibrated refractometers

• SPS keepers requiring tight salinity control

• Anyone wanting a reliable, seawater-specific refractometer with no guesswork or conversions