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, improving accuracy. Upgraded eyepiece with heavy crown optical glass lens for enhanced clarity and reduced observer fatigue. Product application: Refractometer features a simple structure, shock resistance, ease of operation, portability, clear field of view, and affordability. Sugar series models are used in canned food production, juice manufacturing, wine fermentation, beverages, fruit processing, and honey harvesting. Salt series models are used in marine aquaculture, aquarium maintenance, and saline solution preparation. Medical series models are used for serum protein and urine specific gravity testing. Usage and maintenance precautions: 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 each measurement. Place a few drops of distilled water on the measuring prism, then adjust the zero-adjustment screw until the boundary line 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 Refractometer (25–40% range)