Measuring range: 0-80%. Minimum unit: 1% Accuracy: 1% Reference temperature: 20C. 1. Accurate measurement based on good calibration, please calibrate the refractometer before your first use. 2. Please keep the refractometer dry and clean to keep the instrument accurate and durable. NOTE: Not recommended for wine or others that are high in sugar and other ingredients. 1. EASY AND QUICK MEASUREMENT Alcohol refractometer for testing alcohol-alcohol volume percentage for brandy, whiskey, vodka, etc. 2. ACCURATE READINGS WITH ATC: Handheld alcohol refractometer with automatic temperature compensation (ATC), no need to worry about temperature change affecting reading accuracy. The refractometer for measuring the percentage of alcohol by volume takesinto account changes in ambient temperature and automatically compensates for them accordingly to allow accurate and repeatable measurements. 3. Endless Use: It is a portable optical instrument for bartenders, liquor dealers and food manufacturers, etc. The scale range is 0 - 80% V/V (V/V - volume of alcohol in percent), division: 1% v/v. 4th Metal + Plastic: The alcohol refractometer is made of non-coloring, non-corrosive and non-reactive aluminum, easy to carry, scratch resistant and durable. Delivery Quantity: 1pc Package Contents: Only the above package content, other products are not included. Size: 20.5*7.7*5.5cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Colour: Black (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)