Main technical parameters: Measurement range and minimum scale: Sugar content: 0–40%, minimum scale: 0.2%; Alcohol content: 0–25%; Features temperature compensation to minimize measurement deviation caused by temperature changes; Upgraded eyepiece with heavy crown optical glass lens for improved clarity and reduced observer fatigue. Product Application: Refractometer features a simple structure, shock resistance, ease of operation, portability, clear field of view, and afability. Sugar series models are used in canned food, juice production, wine fermentation, beverages, fruits, and honey harvesting. Salt series models are used in marine aquaculture, aquariums, and physiological saline preparation. Medical series models are used for serum protein and urine specific gravity testing. Precautions for use and maintenance: 1. Handle with care and follow instructions carefully. Do not loosen instrument connections, drop, strike, or subject to severe vibration. 2. After use, do not immerse in water. Clean with a soft, clean cloth. Avoid scratching or impacting optical surfaces. 3. Store in a dry location, away from corrosive gases. Calibration: Calibrate the zero point before measurement. Place a few drops of distilled water on the detection prism and adjust the zero adjustment screw until the boundary aligns with the 0% mark. Wipe the prism clean before testing. Some models require a standard calibration solution instead of distilled water. Product name: Handheld wine concentration meter (25–40%)