Features: Practical Refractometer: it is used to test the concentration and refractive index of sugar-containing solution in fast and effective way. LCD Digital Display: using LCD large screen display to simultaneously display temperature, sugar content, and refractive index, 1.5-inch display screen with backlights for clearly display. Precise Optical Instrument: adopts optical refractive sensors for quickly measuring in second, with high accuracy of ±0.2% and resolution of 0.1%. Dust-proof Protective Cover Design: well protect the optical prism, easy to clean, suitable for measuring various solution.Automatic Temperature Compensation Function: for immediate and accurate calibration reading, not affected by the environment, reducing measurement errors caused by different temperatures. Wide Applications: it can be used in sugar, beverage and other industrial sectors, as well as in agricultural production and scientific research for sugar content measurement of products with high sugar content. Specifications: Component:Metal+Plastic Size: Approx.113x56x32mm/4.45x2.22x1.25inch Measuring Ranges: 0.0%~35.0% Resolution: 0.1% Ambients Temperature: 10~40℃ Temperature Compensation: 10~40℃ Accuracy: ±0.2% / ±0.5℃ Refractive Index Display: 1.333~1.426 Power Supply: 3x1.5VAAA battery (NOT included) Package Includes: 1pcs Digital Refractometer note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.