1.accurate Measurement Based On Good Calibration, Please Calibrate The Refractometer Before Your First Use.2.please Keep The Refractometer Dry And Clean, Which Can Make The Instrument Accurate And Durable.note:not Recommend For Wine Or Others Which Contains Much Sugar And Other Ingredients.easy & Quick Measuringalcohol Refractometer Designed For Testing Spirit Alcohol Volume Percent, For Brandy, Whisky, Vodka Etc. Note: Not Recommend For Wine Or Others Which Contains Much Sugar And Other Ingredients.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.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.metal + Plastic:the Alcohol Refractometer Is Made Of Non-staining, Non-corrosive And Non-reactive Aluminum Which Is Lightweight To Carry,anti-scratch And Durable.note: Not Recommend For Wine Or Others Which Contains Much Sugar And Other Ingredients.product Descriptionmaterial: Metal + Plasticmeasuring Range: 0-80%.minimum Unit: 1%accuracy: 1%reference Temperature 20caccessories: 1 *measuring Instrument 1 * Pipette1 * Cleaning Cloth1 * Screwdriver