It is more accurate than a hydrometer and easy to measure. Measuring range: Brix (sugar): 0 - 32%, SG word 1.000-1.130. Resolution: Brix (sugar): 0,2%, Automatic temperature compensation (10 ~ 30 ). It is suitable for Home-brew Beer wort, sugar concentration in fruit juices, soft drinks, vegetables, food and cooling lubricants. The internal optical lens with high refractive index forms the optical precision system. The instrument is resistant to abrasion and corrosion. Can be measured acidic and alkaline as well as other corrosive liquids. Calibration: zero calibration with the distilled water at 20 C, automatic temperature compensation between 10 C and 30 C (ATC). Product description Applications: 1. fruits, vegetables & grasses: monitoring and control of sugar concentration in food, beverages, cereals and plants, checking ripening of fruit in the field and checking product quality after harvesting and checking concentrations during processing and packaging to ensure product quality. 2. wine: If you use a refractometer to measure SG data, the solution is measured after fermentation. Measure the end of liquid fermentation and measure the finished wine. If you have any questions, please contact me. I will tell you how to use it correctly, in which case. 3. metalworking fluids: It is commonly used to control the concentration of various industrial fluids such as cutting lubricants and flux rinsing agents. Warning maintenance: 1. Calibration fluids can use clean water. This product does not require frequent calibration. However, you must keep the prism and transparent parts clean and dry. Accurate measurement is required. 2. Do not expose the instrument to humid working conditions. Do not immerse the instrument in water. If the instrument becomes foggy, water has entered the body. You can keep this product in a dry place for a few days to solve the problem. Or contact us for assistance. 3. The instrument is resistant to abrasion and corrosion. Can be measured acidic and alkaline as well as other corrosive liquids. However, we do not recommend measuring these liquids for long periods of time. The residue should be cleaned immediately after measurement. 4. This is an optical instrument. Do not require regular maintenance.