"Degrees Brix (symbol °Bx) is the sugar content of an aqueous solution. One degree Brix is 1 gram of sucrose in 100 grams of solution and represents the strength of the solution as percentage by weight (% w/w). If the solution contains dissolved solids other than pure sucrose, then the °Bx only approximates the dissolved solid content. The °Bx is traditionally used in the wine, sugar,fruit juice, and honey industries."
Okay, what does that have to do with grapes and wine?
Measuring how much sugar the grapes have is an indication of how ripe the fruit is and approximately how much alcohol we will get when the yeasts convert the sugars!
Brad like to pick his grapes at 24.5% so that will give us about 14% alcohol. For more info, click here.