Product description material: metal + plastic target range: 0-80%. Minimum unit: 1% accuracy: 1% reference temperature: 20 br > availability: 1 * measuring device, 1 * pipette, 1 * cleaning cloth, 1 * screwdriver note: 1 Accurate measurement is based on good calibration. Please calibrate the refractometer before first use. 2. Keep the refractometer dry and clean to make the instrument accurate and durable. Note: it is not recommended for wine or other products with high sugar and other ingredients. 1. A simple and fast alcohol refractometer is used to test the volume percentage of alcohol in cognac, whisky, vodka, etc. Note: it is not recommended to use in wine or other products with high sugar content and other ingredients. Accurate reading of ATC: the handheld alcohol refractometer is equipped with automatic temperature compensation (ATC), so there is no need to worry about the impact of temperature change on the reading accuracy. The refractometer used to measure the volume percentage of alcohol considers the change of ambient temperature and automatically compensates it accordingly to achieve accurate and repeatable measurement. Unlimited use: it is a portable optical instrument for bartenders, wine merchants and food manufacturers. The scale range is 0 - 80% v / V (V / V - volume percentage of alcohol), and the scale is 1% v / v. Fourth, metal + plastic: alcohol refractometer is made of non staining, non corrosive and non reactive aluminum, which is easy to wear, scratch resistant and durable. 5. Note: it is not recommended for wine or any food with high sugar or other ingredients. No longer worry about temperature changes affecting reading accuracy. The refractometer used to measure the volume percentage of alcohol considers the change of ambient temperature and automatically compensates it accordingly to achieve accurate and repeatable measurement. Unlimited use: it is a portable optical instrument for bartenders, wine merchants and food manufacturers.