Description: Type : Prism refractometer Equipped with scale measurement which provides direct reading. Extremely easy-to-use and calibrat. Adjustable manual focusing. Uses ambient light only which means battery or power source is not required. Measuring range: 0 - 32% Brix. Reference Temperature: 20C. ATC(Automatic Temperature Compensation) Compensation Range: 10C~30C (50F~86F). Package include : 1 x Refractometer 1 x Pipette 1 x Screw driver 1 x Cleaning cloth USE: 1. Align the Cover Plate with light, adjust the Focus Adjustment until you see the scale clearly. 2. Calibration: Accurate Measurement depends on careful calibration. Please make sure the ambient temperature is about 68 F, distilled water can be used to calibrate. 3. Open the Cover plate. place 2-3 drops of the distilled water on the prism, then close the cover plate and make sure the water spread aross the prism without any air bubbles or dry spots. wait for about 30 seconds to let the reading to stabilize. Look into eyepiece and turn the calibration screw with the screw driver until the reading is 0. 4. Please leep the refractometer dry and clean in the box, which can make sure the reading accuracy and durable. 0-32% Brix refractometer can measure the sugar content in fruit, food, juice, tea and drinks as well as the measurement of sugary liquids such as brandy, beer, fruit juice.