Main technical parameters:Measurement range and minimum scale: Sugar content: 0-40% Minimum scale: 0.2%; Alcohol content: 0-25%; It has temperature compensation function to overcome the data deviation caused by temperature changes and make the data more accurate; The eyepiece has been upgraded, and the lens glass is heavy crown optical glass, not ordinary glass, with higher clarity, reducing the fatigue of the observer. Product Application: Refractometer has the advantages of simple structure, shockproof, easy operation and portability, clear field of vision, low price, etc.Sugar series is used in canned food, juice manufacturing, wine fermentation, beverages, fruits, honey harvesting and other fields.Salt series is used in marine aquaculture, aquarium, physiological saline preparation and other fields.Medical series is used in the detection of serum protein and urine specific . The following precautions should be taken during use and maintenance:1. Be careful and cautious during use and strictly follow the instructions. Do not loosen the connecting parts of the instrument at , do not drop or collide, and do not allow severe vibration.2. After use, do not put it directly into water for cleaning. Use a clean soft cloth to wipe it. The optical should not be bumped or scratched.3. The instrument should be in a dry place without gases. Calibration: The instrument needs to calibrate the zero point before measurement. Take a few of distilled water, put them on the detection prism, turn the zero adjustment screw to adjust the dividing line to the 0% scale position. Then wipe the detection prism clean and perform the test. Some models of instruments require standard liquid instead of distilled water when calibrating. Product name: Handheld wine concentration meter 25-40%; This product adopts domestic advanced manufacturing technology, and its quality and accuracy are other ! Instructions for use: 1) Align the refracting prism in the direction of light and adjust the eyepiece diopter ring until the marking line is clear; 2) Adjust the reference: Before measurement, first make the standard solution (pure water), the instrument and the liquid to be measured based on the same temperature. Open the cover, then take 1~2 of standard solution and drop them on the refracting prism, and gently press the cover with your hand to draw a light-dark dividing line. Rotate the calibration bolt to make the light-dark dividing line in the eyepiece field 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, wipe the of the prism with a soft flannel, take 1~2 of the measured solution and drop them on the refracting prism, cover the cover and press gently, and read the relative scale of the light-dark dividing line, which is the concentration value and density value of the measured liquid. 4) After the measurement is completed, directly wipe off the attachments on the prism and the cover with a damp flannel, wait for it to dry, and store it properly. Colour:Black Material:ABS Package Contents: 1 set of sugar content tester (Due to different batches, the color and style of accessories are random , don' accept the specified and not affect the use) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.