Name: Fruit Sugar Meter Battery capacity: 600 mAh, can be used 2000 times BM-03: charging range 0-35% accuracy 0.5% BM03S charging range 0-55% accuracy 0.5% BM04 charging range 0-35% accuracy 0.2% BM04S charging Range 0-55% precision 0.2 BM05 charging Range 0-35% precision 0.2 BM05S charging Range 0-55% precision 0.2 BM-06 color screen range 0-35% accuracy 0.1% BM06S color screen Range 0-55% accuracy of 0.1% BM-07 charging range 0-55% accuracy 0.1% Easy to use: Do zero calibration when you use it for the first time. Then drop the sample, close the lid and press the start button and the Bailey Brix value will be displayed on the screen. HD Digital Whiteley Sugar Meter for quick readings. Fruit Sugar Meter is equipped with 600mah built-in lithium battery: one full charge can last at least one month. usb rechargeable, environmentally friendly The sample jar part is waterproof and can be cleaned under running water after use. Please keep the charging port away from water. GOOD ASSISTANT: The refractometer is a good assistant for brewers, winemakers, food and beverage producers, fruit growers and sellers. How to use: (1) Cleaning (2) Drop sample (3) Close the lid (4) Press "Start". Calibration: (1) Turn on the machine (2) Drop about 0.3ml of pure water and close the lid. (3) Press "ZERO" twice. (4) One flash (5) Press "ZERO". (6) 0.0% Bailey's Sugar Level, Calibration Successful!