Review on 🌡️ Extech RF20 Temperature Compensation Refractometer: Accurate Measurements with Advanced Temperature Compensation Technology by Michael Moonin

I use this device to measure the salinity in my aquarium and for the first time I know the true value of this important parameter. At first I used an ordinary plastic hydrometer and trusted the results, but then I bought a second hydrometer and the readings were completely different from the first one. That's when I realized I needed more accuracy, and this machine is certainly more expensive, but the accuracy you get is worth the extra money. It turned out that the salt level in my tank was too high and that was the cause of several problems I was having with the tank. The instrument is very easy to calibrate, you only need distilled water and 10 seconds of your time, and it is also very easy to use.