Characteristics: Made of high-quality aluminum, durable and durable. 3 in one handheld refractometer, measuring ranges 0-25% vol., 0-40% Brix and 0-22 Baume. Accurate test results, easy to calibrate. You can accurately measure Brix Baume alcohol content in seconds! Soft, non-slip rubber grip provides a comfortable grip. Suitable for restaurant, winery, castle wine, family dinner etc. Specification: Material: aluminum Color: as shown in the photos Measuring range: 0-25 Vol%, 0-40% Brix, 0-22 Baume Length: approx. 15.5 cm / 6.1 inches Center Diameter: Approx. 2.9 cm / 1.1 inch Max Diameter: Approx. 3.9 cm / 1.5 inch Weight: approx. 230g/8.1oz Package List: 1 x refractometer (with box) 1 x pipette 1 x Screwdriver 1 x cleaning cloth 1 x User Manual Using the manual: Open the cover, use a clean cloth to wipe the prism. Apply a few drops of the test liquid to the detection prism and then slowly close the cover plate to avoid the formation of bubbles which will cause the liquid to spread over the entire surface of the prism. Put the cover directly on the light source or bright place, observe the field of view through the eyepiece. Rotate the eyepiece to adjust the dial so that the blue and white lines are clear. The scale value of the split line is the lye concentration. Note: