Thanks to this refractometer, you can easily check the quality of the grapes and thus better brew your wine The refractometer is mainly developed to test the sugar content of original grape juice, and then to determine the potential alcohol content of grape wine, fermented grape juice. It cannot be used to measure the alcohol content of wine. Measurement range: Brix (mas sacch): 0-40%, alcohol: 0-25, Resolution: Brix (mas sacch): 0.2%, alcohol: 0.2% Easy to use. Place 2.3 drops of sample on the main prism, close the plate and look through the window at the Brix reading; CALIBRATION: zero calibration with water at 20C, automatic temperature compensation between 10C and 30C (ATC) Sharp precision measurement dividing line (blue- white), easy to read (daylight visible), adjustable eyepiece for focus adjustment Calibration: zero calibration with distilled water at 20C, automatic temperature compensation between 10C and 30C (ATC). Number of shipments: 1 pcs