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For your tank dwellers


Controlling the salt level in your aquarium is essential for the health of your fish and the thriving of your plants.

The SmartRef determines the salt content of your saltwater aquarium in ppt, PSU, and SG 20/20. Combined with the mobile app Reef Meister for iOS & Android, you are now able to not only perform regular measurements but keep track of your data with features like in-app storage, management, visualization, and data export.

Reef Meister App for SmartRef Digital Refractometer Saltwater Aquarium and Pool Salinity in PPT, PSU, SG

With a small sample volume of only 0.4 mL, SmartRef and the Reef Meister app deliver highly precise results with automatic temperature compensation (ATC):

  • Practical salinity units [PSU]
  • Salinity in parts per thousand [ppt]
  • Specific gravity [SG 20/20]
  • Temperature [°C], [°F]
View all specifications
Determination of salinity in your reef tank with SmartRef Digital Refractometer

Determination of salinity in your reef tank with SmartRef Digital Refractometer

Measuring salinity in reef tanks is crucial for any saltwater aquarium owner. Learn what to consider when taking measurements and how best to proceed.

Learn more

Device features

High accuracy

High-precision measurement sensor with an accuracy of 0.2 °Brix

Wide measuring range

Measuring range from 0 to 85 °Brix with automatic temperature compensation


Free mobile app for iOS & Android with smart measurement guidance for precise results

Waterproof design

IP66 dust-tight and protected against powerful water jets

Why SmartRef?

Other refractometers
One device for all units
Continuous measurement mode
Simple cleaing & adjustment
Sample verification for reliable results
Smart data management via mobile app
Over-the-air updates with new features & scales
Automatic in-app calculations
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