Measure the absolute salinity of seawater with the help of our highly accurate aquarium refractometers by Red Sea and Smart Reef. With these no-brainer but highly accurate salinity refractometers, there’s no need to calculate the temperature because they are calculated using an algorithm for seawater, not brine. This produces accurate results that’s unmatched by other brands. If you’re maintaining a marine aquarium, it’s important to find the best refractometer to ensure you’re providing your sea creatures the healthiest environment.

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