Portable Hand Held Grape and Wine Alcohol Refractometers 0-25% Vol 0-40% Brix 0-22 Baume Features: 1. Made of aluminum, heavy duty and durable. 2. 3 in one hand held refractometers, with mesure range 0-25% Vol, 0-40% Brix and 0-22 Baume.  3. Accurate test results, easy to calibrate. You can measure the brix &baume& alcohol content accurately in seconds!  4. Soft, non-slip rubber handle, ensure a comfortable grip. 5. Suitable for restautant, Vineyard, Chateau wine, family dinner etc. Specification: Condition: Material: Aluminum Color: As Pictures Shown Measurement range: 0-25% Vol, 0-40% Brix, 0-22Baume Length: approx.15.5cm/6.1in Middle Diamter: approx.2.9cm/1.1in Maximum Diamter: approx.3.9cm/1.5in Weight: Approx.230g/8.1oz Package list:  1 x Refractometer(with A Box) 1 x Pipette 1 x Screwdriver 1 x Cleaning Cloth 1 x User Manual  Using Instruction: 1. Open the cover plate, use a clean cloth to wipe the prism.  2. Take a few drops of testing liquid to the detection prism, then close the cover plate slowly  to avoid producing bubbles which will make the liquor 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 liquor. Note: 1. Please allow 0~1 inch error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.