Fermentaholics Universal Triple Scale Hydrometer allows gravity readings to be taken in three different scales simultaneously. Like Fahrenheit vs. Celcius, choose which of the three scales you prefer to use. The scales include BRIX, Specific Gravity Reading, and Potential Alcohol By Volume (ABV). Beer brewers mostly use the specific gravity scale, while winemakers mostly use the BRIX scale. No matter your preference or experience level, your hydrometer has you covered.