Feature: 1. No moving parts, high sensitivity and wide dynamic linear range. 2. The amount of sample and reagent is small, and the analysis speed is fast. 3. Battery‑powered, low power consumption, automatic shutdown function for 2 minutes of no operation. 4. Automatic temperature compensation function. Operation mode conversion: refractive index / sugar content. 5. The operation is simple and fast, small size, light weight, easy to carry. Specification: Item Type: Refractometer Material: ABS Color: As shown in the picture Measuring Range: 0.0-55.0%Brix Graduation Value: 0.5Brix/0.1°C Accuracy: ±0.5Brix/1℃ Temperature Compensation: 10-80℃ Use Environment: 10-40℃ Sample Volume: ≥0.2ml (3-5) drops Test Time: About 3s Working Power Supply: 1.5V AAA x 2 (not included) Battery Life: About 2000 times How to Use: Calibration Steps: Step 1: Clean with pure water several times and wipe the prism. Step 2: Add 3-5 drops of pure water and close the shading cover. Step 3: Long press "Cal" until "DONE" appears on the screen. Measurement Steps: Step 1: Put 3-5 drops on the sample solution. Step 2: Close the shading cover. Step 3: Press the "MEAS" key, long press to switch (refractive index-salinity). . Package List: 1 x Refractometer(Battery Not Included)1 x Glasses Cloth1 x Waterproof Protective Film1 x Cross Screwdriver2 x Dropper4 x Screwdriver1 x Manual Juicer1 x Instruction Manual Note: 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.