Specifications: Condition: 100% Brand New Material: Aluminum Color: Showing as picture Measuring Range: 0~ 80% Alcohol Minimum Scale: 1% Alcohol Automatic Temperature Compensation: 0~30 Size: approx. 30 x 40 x 205mm / 1.18 x 1.57 x 8.07inch Weight: approx. 240g 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. 4. Turn the eyepiece to adjust the hand wheel to make the blue and white line clear. The scale value of the dividing line is the concentration of the solution. Package Included: 1 x Alcohol Refractometer 1 x Screwdriver 1 x Dropper 1 x Wipe Cloth 1 x Storage Case Note: Please use this instrument according to the instruction, be careful when using. Do not loose any connection part arbitrarily, prevent violent shock, impact and falling off.