Temperature compensation: Sugar refractometer uses a temperature compensation design to overcome temperature changes. When the ambient temperature changes (0-30 C), the sugar meter can automatically adjust the temperature to the optimum temperature of 20 C for measurement. Measuring range: Measuring range is 0-90%, Suitable for jam, syrup, liquid sugar and other products with more sugar, to test the sugar content of sugar, food, fruit, honey drinks, etc. Principle: Depending on different concentrations of liquid, there will be different refractive indexes. It is for measuring honey, condensed milk, vegetable oils, fruit sugar syrup. The sugar content of jams by testing the sugar in honey, percentage of sugar in juice, drinks, wine, beer etc. Package: Sugar refractometer, dropper, screwdriver, cleaning cloth and user manual. Please download the manual in French: http: //guide.next-match.net/files/C03270-Manuel%20franais.pdf.