Product material: metal + plastic Measuring range: 0-80% Minimum unit: 1% Accuracy: 1% Reference temperature: 20°C Accessories: 1 x measuring device, 1 x pipette, 1 x cleaning cloth, 1 x screwdriver Note: 1. Accurate measurement requires proper calibration. Please calibrate the refractometer before first use. 2. Keep the refractometer dry and clean to ensure accuracy and longevity. NOT RECOMMENDED for wine or liquids high in sugar and other ingredients. ACCURATE READINGS WITH ATC: Handheld alcohol refractometer with automatic temperature compensation (ATC). Eliminates errors caused by temperature variations. Automatically adjusts for ambient temperature changes to deliver accurate and repeatable alcohol by volume measurements. VERSATILE USE: Portable optical instrument ideal for bart s, alcohol dealers, and food manufacturers. Scale range: 0–80% V/V (alcohol volume percent), division: 1% V/V. DURABLE CONSTRUCTION: Made of non-staining, non-corrosive, and non-reactive aluminum with plastic components. Compact, scratch-resistant, and built for long-term use.