Red Sea High-Accuracy Seawater Refractometer
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Accurate Salinity Testing for Marine Aquariums
The Red Sea High-Accuracy Seawater Refractometer is specifically designed for measuring the salinity of marine and reef aquarium water.
Rather than using a scale calculated for simple sodium chloride brine, Red Sea's refractometer is calibrated for the ionic composition of natural seawater (NSW), helping provide more relevant salinity measurements for reef aquariums.
Designed Specifically for Seawater
Many general-purpose refractometers use an algorithm based on sodium chloride brine rather than natural seawater.
Because seawater contains calcium, magnesium, potassium and many other elements in addition to sodium chloride, its refractive properties are different.
Red Sea states that using a conventional brine refractometer for seawater can produce a difference of approximately 1.5 ppt.
Reef-Focused Scale
The refractometer directly reads the absolute salinity of seawater at 25°C, with a clear scale focused on the marine aquarium range up to 40 ppt.
This makes it quick and easy to check salinity when:
• Monitoring your aquarium
• Preparing new saltwater
• Carrying out water changes
• Checking replacement water
• Maintaining stable reef conditions
Automatic Temperature Compensation
Integrated ATC – Automatic Temperature Compensation compensates for small differences between ambient temperature and the calibrated temperature of the refractometer.
For best results, allow the refractometer and water sample to equalise to the same temperature before testing.
Why Choose the Red Sea Refractometer?
• Designed specifically for seawater
• Calibrated for natural seawater at 25°C
• Reads absolute salinity directly
• Reef-focused scale up to 40 ppt
• Integrated Automatic Temperature Compensation
• Clear, high-resolution display
• Requires only a small water sample
• Fast and convenient for routine testing
Fast, accurate and designed specifically for seawater – an excellent everyday salinity tester for marine and reef aquariums.