Product Material: metal + plastic Measuring range: 0-80%. Minimum unit: 1% Accuracy: 1% Reference temperature 20 C. Accessories: 1*Meter1*Eyedropper, 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 to make the instrument accurate and durable. NOTE: Not recommended for Wine or others that contain a lot of sugar and other ingredients. 1. EASY AND FAST MEASUREMENTAlcohol refractometer to test alcohol alcohol volume percentage for brandy, whiskey, vodka, etc. NOTE: Not recommended for wine or other products that contain a lot of sugar and other ingredients. 2. ACCURATE READINGS WITH ATC: Handheld alcohol refractometer with automatic temperature compensation (ATC), no longer worry about the temperature change will affect the reading accuracy. The refractometer for measuring alcohol volume percentage takes into account changes in ambient temperature and automatically compensates accordingly to ensure accurate and repeatable measurements. 3. Endless Application: It is a portable optical instrument for bartenders, alcohol dealers and food makers, etc. The scale range is 0 - 80% v/v (v/v - alcohol volume percentage), division: 1% v/v.4. Metal + Plastic: The alcohol refractometer is made of non-staining, non-corrosive and non-reactive aluminum, which is easy to carry, scratch-resistant and durable. 5. NOTE: Not recommended for wine or others that contain a lot of sugar and other ingredients.