Use: It is for measuring , Condensation of Milk, Fruit Sugar Syrup, Jams and Molasses. Measurement Range: Brix: 58-90% Brix, Resolution: Brix: 0.2% . Easy to handle. Place 2.3 drops of the sample on the main prism, close the plate and look through the viewing window to read the Brix value. If you don't have professional calibration equipment, please don't calibrate yourself. Do not calibrate this refractometer with water. Precision measurement: one dividing line (blue/white), excellent readability (daylight) and recognizable, adjustable focus eyepiece. Accessories: pipette, cleaning cloth, and box. With Pipette you can easy liquid test. We do not provide calibration equipment and standard fluids. Method of operation: Calibration: Take a few drops of distilled water, place it on the detection prism, turn the adjustment screw from zero to adjust the dividing line to the 1.000 position, then wipe the detection prism for detection. Open the cover and carefully wipe the detection prism with a soft cloth. Take 2 drops of the solution to be tested and place them on the detection prism. Carefully close the lid and flatten it to avoid air bubbles. Make sure the liquid covers the surface of the prism. Align the prism of the instrument. In the quasi-light source or in a bright place, the eyes observe the field of view through the eyepiece and turn the eyepiece adjustment wheel to make the blue and white dividing line of the field of view The value of dividing line scale is the urine specific gravity value of the measured liquid. Delivery quantity: 1 piece "Reminder: only test the sugar content, not moisture"