material: metal and plastic measuring range: 0-80% minimum unit: 1% accuracy: 1% reference temperature 20 C accessories: 1 measuring device 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 clean for the instrument to be accurate durable NOTE: Not recommended for wine or others that are high in sugar other ingredients 1 EASY FAST MEASUREMENT Alcohol Refractometer for testing alcohol-alcohol volume percentage for bry, whiskey, vodka, etc NOTE: Not recommended for wine or any other product that is high in sugar other ingredients 2 ACCURATE READINGS WITH ATC: Hheld alcohol refractometer with automatic temperature compensation (ATC), no more worry about the temperature change affecting the reading accuracy The refractometer for measuring the percentage of alcohol by volume takes into account changes in the ambient temperature automatically compensates for them accordingly to enable accurate repeatable measurements 3 Endless use: It is a portable optical instrument for bartenders, alcohol dealers food manufacturers, etc The scale range is 0 - 80% V / V (V / V - alcohol volume in percent), division: 1% v / v 4th Metal and Plastic: The alcohol refractometer is made of non-staining, non-corrosive non-reactive aluminum, which is easy to carry, scratch-resistant durable 5 NOTE: Not recommended for wine or anything high in sugar or other ingredients