Brix Hydrometers are calibrated to show the percentage of sucrose by weight at 20°C. The Brix Scale is based on the following: 1° Brix = 1° sucrose by weight at the specified temperature (20°C). the data of the National Bureau of Standards are used.
On select Brix Hydrometers with a built-in thermometer, the thermometer scale is located in the body of the hydrometer. All of the thermometers have a rage of 0-50°C with 1° subdivisions. A correction scale for conversion of the Hydrometer Brix reading to it's 20°C value is printed opposite the temperature scale.