HHTEC Portable Refractometer - Automatic Temperature Compensation for Liquid It allows quick control of the emulsion concentration of cooling and lubricating fluids. This makes it possible to use these liquids in optimal concentration. Measuring range: Brix (sugar): 0-18%, resolution: Brix (sugar): 0.1% automatic temperature compensation (10 ? ~ 30 ?) and calibration screw (calibrate "0") Easy to use. Place 2.3 drops of the sample on the main prism, close the plate and look through the viewing window to read the Brix value Precision measurement: sharp dividing line (blue-white), good readability (daylight visible), adjustable eyepiece for sharpness adjustment Calibration: zero calibration with the distilled water at 20 C, automatic temperature compensation between 10 C and 30 C (ATC). We take our reputation seriously, we buy and sell online, so we understand the value of trust! If you are unsatisfied with your order, please contact us and we will work with you to resolve it to your satisfaction! Thanks for looking at our listing and supporting our small family business! shelf 56 NT