1. **Accurate Measurement**: The Wine Tester Handheld Refractometer is designed for precision, measuring sugar content from 0-40% and alcohol content from 0-25%. With its advanced temperature compensation function, you can trust that your readings are reliable even in fluctuating temperatures. 2. **Premium Optical Quality**: Equipped with a refractive optical glass lens, this refractometer offers higher clarity compared to standard glass. This enhancement significantly reduces observer fatigue, allowing you to take multiple measurements with ease. 3. **User-Friendly Operation**: Follow our simple instructions for use: aim the refractive prism at a light source, adjust the eyepiece for clarity, and apply the solution to the prism surface. The clear reading of the light-dark dividing line gives you an accurate concentration of the liquid being measured. 4. **Easy Calibration**: Zero calibration is straightforward; simply place distilled water on the test prism and adjust to 0% on the scale. This ensures your refractometer is always ready for precise measurements of wine or other liquids. 5. ** and Careful Maintenance**: This refractometer is a precision instrument that requires careful handling. Keep it clean with a soft cloth, avoid direct water contact, and store it safely to maintain its accuracy and longevity.