It is used to measure the sugar content of beer, grape juice and wort before fermentation and is an indispensable tool for cider and wine production. Sugar content and potential alcohol content are easily determined prior to fermentation and help achieve desired taste and alcohol levels. Easy to use, we provide detailed usage instructions , including operating instructions, glucometer consultation chart, refractometer consultation chart operation method, etc., even if you are a beginner, you can use it easily. Measuring range: measuring range: 0.990-1.160 (for measuring grape juice, fruit juice), scale: 0-35 (for measuring beer wort), alcohol concentration 0-20% (the value is invalid). It is only suitable for measurement in the production of beer, wine and fruit wine Due to the difference in density, it cannot be used directly to measure the degree of beer, wine and fruit wine. (Professional 250ml plastic or glass bottles are recommended) Reliable Customer Service: Want to give our customers a good shopping experience.