(HY150) Used for both wine and beer. Allows you to keep track of your fermentation`s progress and determine the finished product`s alcohol content by taking readings before and after fermentation and comparing them. Also, allows you to verify when your batch is ready to bottle. Shows Specific Gravity scale from .990 to 1.170, Balling degrees scale from -3 to +35 and Potential Alcohol scale -2 to +22%. Also has a built in thermometer to monitor your fermentation`s temperature. Comes with complete instructions.