Review on 🔬 Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution (color may vary) - Enhanced SEO by Gary Konduru

This digital refractometer appears to be very well built, extremely easy to use and calibrate and comes with sample calibration solutions (distilled water) and salinity test liquid to ensure it is calibrated. Yes, you have to calibrate it every time you turn it on, why wouldn't you want to? I used a hydrometer on my 55 gallon setup, it always read 1.023 sg and that's what I wanted. I will be dealing with corals so I wanted to make sure my water is 1,025 sg for them to thrive. I checked the salinity of the water and with this digital refractometer it was 1.028 which is much higher than the hydrometer shows. I checked with a salinity test liquid to make sure my salinity was really that high! Now I know I can't rely on anything other than this digital refractometer.