The results are accurate, with a concentration measurement range of 0-80% and a minimum scale of 1% Automatic Temperature Compensation: It's automatic temperature compensation is 030.with automatic temperature compensation Using Instruction: 1. Open the cover and carefully wipe the prism with a soft cloth. 2. Take a few drops of the solution to be measured, place on the detection prism, gently close the cover to avoid producing bubbles which will make the solution spread all over the prism surface. 3. Put the cover directly point to the light source or bright place, observe the field of view through the eyepiece. Professional measuring instrument for alcohol concentration of Baijiu Specifications: The size of the alcohol refractometer is about 30 x 40 x 205mm/1.18 x 1.57 x 8.07 inches, which is easy to operate and calibrate.