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Keith7534
Hello everyone. I have a hydrometer, AON-2 GOST 18481-81 20°C, which means I understand it is calibrated at a temperature of 20°C. I checked it in distillate at 20°C, and it indeed showed 1.000. I measured the density in my aquarium at 27°C and got 1.024. The question is, what is the accuracy of this device? Thank you very much in advance!