Feature: 1. Brix refractometer has a wide measurement range and is suitable for almost any sugar‑containing substance. 2. 0 to 50％ high range detection, high accuracy, resolution, and wide application. 3. Elegant color and stylish design, compact size and portable, easy to carry anywhere and anytime. 4. With automatic temperature compensation function, ranging from 10℃ to 40℃. 5. Power saving, after 3 minutes without any operation, it will automatically turn off the power. Specification: Item Type: Refractometer Material: Plastic Color: As shown in the picture Product Size: Approx.121x58x25mm/4.76x2.28x0.98in Weight: Approx.313g/11oz Range: 0 to 50% Brix / 0 to 80°C Resolution: ±0.1% Brix/±0.1°C Accuracy: ±0.2% Brix/±0.3°C Automatic Temperature Compensation: 10-40°C. Measuring Time: About 1.5 seconds Minimum Sample Size: 2 metric drops Light Source: Yellow LED Automatic Power Off: After 3 minutes of non-operation Power Supply: 1 x AAA battery (not included) Start using after installing the battery Calibration method: The instrument only supports pure water calibration. The calibration method is as follows: 1. Drop 4-5 drops of purified water into the drip opening 2. Press the "Calibration" key for 2 seconds to enter the calibration state. 3. Press the "Calibration" button once to start calibration. If you don't press any button, it will return to the power-on state after 10 seconds. 4. After the calibration is completed, you can put the liquid to be measured on the drip port, close the lid, and the reading will be displayed for a moment . Package List: 1 x Refractometer(Battery Not Included)1 x Dropper1 x Instruction Manual1 x Protective Case Note: 1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.