Note: Use a refractometer to measure the current Brix level of your juice. Place a few drops of juice on the refractometer's prism, close the cover, and read the Brix value through the eyepiece.

Degrees Brix (symbol °Bx) is a measure of the dissolved solids in a liquid. It is commonly used to measure dissolved sugar content of a solution. One degree Brix is 1 gram of sucrose solute dissolved in 100 grams of solution and represents the strength of the solution as percentage by mass.