A device, either physical or digital, that determines the density of a liquid relative to the density of water, specifically applied to the context of winemaking. This tool allows winemakers to measure the sugar content present in grape juice or wine at various stages of the fermentation process. For instance, a winemaker might use it before fermentation to assess the initial sugar concentration of the must or after fermentation to verify the complete conversion of sugars into alcohol.
This measurement provides crucial insights into the potential alcohol content of the finished wine and the progress of fermentation. Accurate determination of sugar levels enables winemakers to make informed decisions regarding fermentation adjustments, predict the final alcohol level, and ensure consistency in their wine production. Historically, this measurement has been a cornerstone of quality control in winemaking, allowing for the production of wines with predictable and desirable characteristics.