EDEDE Refractometer, Refractometer Salinity Meter Dual Scale Portable Meter With ATC For Seawater Salt Sea Marine Aquarium Reef Tank

【Salinity Refractometer 】Measure Salt Water or Salinity of Water,Monitor and Control the Concentration of Salt Water and Brine,Ideal for Aquariums and Marine Applications 【Measures on 2 Scales】Specific proportion (D 20/20) and parts per thousand and replaces your poor quality and difficult to read hydrometer 【Density Measurement Range 】 1.0-1.070, Minimum Scale is 0.001 【Concentration Measurement Range】 0-100‰, Minimum Scale is 1‰ 【ATC 】Automatic Temperature Compensation, 0-10°C; ① It is necessary to keep the surrounding environment with sufficient brightness and a suitable temperature during use. There is no error when the temperature is 10-30℃. If it deviates from this temperature, there will be a certain error. ② Because people’s focal lengths are different, reverse rotation may be necessary when focusing