Product Name: Professional Refractometer Measuring Range: 0-80 (%) Grid Value: 0.5 (%) Weight: 250 (g) Scope of Application: Sugar Content Measurement, Emulsion Measurement Specification: 0-80% Package Included: 1 x Alcohol Refractometer 1 x Screwdriver 1 x Dropper 1 x Wiping Cloth 1 x Storage Case Using Instruction: 1. Open the cover and wipe the prism thoroughly with a soft cloth. 2. Take a few drops of the solution to be measured, place it on the detection prism, gently close the cover to avoid bubbles that will cause the solution to spread all over the prism. 3. Place the cover directly on the light source or bright place, observe the field of view through the eyepiece. 4. Turn the eyepiece to adjust the handwheel to clear the blue and white lines. The scale value of the dividing line is the concentration of the solution. Note: 1. Be careful when using it. Do not loosen any part of the connection arbitrarily, avoid violent impact, bumps, and falling. 2. Use a clean and soft cloth to wipe the instrument, do not put it directly into water for cleaning, and avoid scratching the surface. 3. Store the instrument in a dry and non-corrosive place. 4. Store the part well. 5. The adjustment range of the eyepiece and handwheel is within 2 cm to the left or right.