1. Alcohol Refractometer designed for testing Pure Alcohol or Spirit Alcohol Volume Percent. NOTE: Not recommend for wine or others which contains much sugar and other ingredients.2. Accurate Readings With ATC: Handheld Alcohol Refractometerr with Automatic Temperature Compensation(ATC),no more worry about the temperature change will influence the reading accuracy.the alcohol volume percent measurement refractometer will account for changes in ambient temperature and automatically compensate accordingly to provides accurate and repeatable measurements.3. Endless Application:It is a portable optical instrument for Bartender, Alcohol Retailer and Food Producing etc.The scale range is 0 - 80 %V/V (V/V - alcohol volume percent), division: 1 %v/v.4. Aircraft Alumium Body Material: The alcohol refractometer is made of non-staining, non- and non-reactive aluminum which is to carry,anti-scratch and durable.5. NOTE: works for alcohol testing (to test the alcohol concentration in the alcohol solution, not the grape wines or the other fruit wines) Not recommend for wine or others which contains much sugar and other ingredients.Measuring Range:w/w 0-80%Minimum Divisions:w/w 1%Accuracy:1%Reference temperature 20CAutomatic Temperature Compensation (ATC: 10-30C)Operation steps1. Open the cover with a soft cloth carefully wipe detection prism.2. Test a few of the solution, placed on the detection prism, gently close the cover ,to avoid air , spreading the solution across the surface of the prism.3. Align the and observe through the eyepiece, adjusting with the wheel.4. Make a clear dividing line between marks. Scale value is the concentration of the solution of the boundary.Colour:BlackMaterial:aluminumPackage Contents:1 * Handheld RefractometerOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.