1. Main technical parameters: Measuring range and minimum scale: Brix: 0-40% Minimum scale: 0.2% Alcohol: 0-25% With temperature compensation function, it can overcome the data deviation caused by temperature changes and make the data more accurateThe eyepiece has been upgraded, the lens glass is heavy crown optical glass, not ordinary glass, which has higher clarity and reduces the fatigue of the observer. 2. How to use: 1) Align the refracting prism in the direction of the light, and adjust the diopter ring until the marking line is clear; 2) Adjust the benchmark: Before the measurement, make the standard solution (pure water), the instrument and the liquid to be tested based on the same temperature. Open the cover, then take 1~2 drops of standard droplets on the refractive prism, and press the cover lightly with your hand to draw a dividing line between light and dark. Rotate the calibration bolt to make the light-dark dividing line in the eyepiece field of view coincide with the reference line (0%); Note: This optical instrument has been adjusted at the factory and can be used directly. 3) Open the cover, clean the surface of the prism with a soft flannel, take 1~2 drops of the solution to be tested on the refractive prism, cover the cover and press gently, and read the relative scale of the dividing line between light and dark, that is, the measured solution The concentration value and density value of the liquid. 4) After the measurement, directly wipe off the attachments on the prism surface and the cover plate with a damp flannel, and store it properly after drying. Correction The instrument needs to calibrate the zero point before measuring. Take a few drops of distilled water, put it on the detection prism, and turn the zero adjustment screw to adjust the dividing line to the 0% position of the scale. Then clean the inspection prism and perform inspection. Some models of instruments need to be equipped with standard solution instead of distilled water when calibrating. Precautions This instrument is a precision optical instrument, the following matters should be paid attention to in the use and maintenance: 1. You must be careful in use, use it strictly according to the instructions, and do not arbitrarily loosen the connecting parts of the instrument, do not drop, collide, and strictly prohibit violent vibrations. 2. After use, it is strictly forbidden to directly put it into water for cleaning. It should be wiped with a clean soft cloth. For the optical surface, it should not be bumped or scratched. 3. The instrument should be stored in a dry, non-corrosive place. 4. Avoid loss of spare parts. 3. Product application The refractometer has the advantages of simple structure, shockproof, convenient operation and portability, clear vision, and low price. Sugar series are used in canned food, fruit juice manufacturing, wine fermentation, beverage, fruit, honey harvesting and other fields.