Product description Material: metal + plastic Measurement range: 0-80%.Minimum unit: 1% Precision: 1% Reference temperature 20 C Accessories: 1 * measuring instrument, 1 * pipette, 1 * cleaning cloth, 1 * screwdriver Note: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: Do not recommend for wine or others that contain a lot of sugar and other ingredients.1. EASY AND QUICK MEASUREMENTAlcohol refractometer designed to test the volume percentage of spirit alcohol, for brandy, whiskey, vodka, etc. 2. ACCURATE READINGS WITH ATC: Portable alcohol refractometer with automatic temperature compensation (ATC), no longer worry about the temperature change will influence the accuracy of the reading. the alcohol volume percentage measurement refractometer will take into account the changes in ambient temperature and compensate automatically accordingly to provide accurate and repeatable measurements.3. Endless App: It is a portable optical instrument for bartender, liquor retailer and food production etc. v.4. Metal + Plastic: The alcohol refractometer is made of non-staining, non-corrosive and non-reactive aluminum, light to carry, anti-scratch and durable.5. NOTICED: Do not recommend for wine or others that contain a lot of sugar and other ingredients.