Easy to use: Place 23 drops of liquid sample onto the prism of this Brix refractometer and obtain the reading directly through the eyepiece. No test tank required, no additional measurement or calculation neededsimple operation for convenient and time-saving use.Main indicators: High-precision Brix refractometer with a range of 090% Brix. Designed for measuring sugar content in fruits, fruit juices, maple syrup, and other sugary beverages. Ideal for home brewing, farming, gardening, and educational applications.ATC design: Features automatic temperature compensation (ATC) from 10C to 30C (50F to 86F), ensuring fast, accurate, and reliable readings with lightweight portability.Instructions: 1. Open the cover and gently clean the detection prism with a soft cloth. 2. Place a drop of distilled water on the prism, adjust the zero calibration screw until the scale reads 0%, then dry the surface. 3. Apply a few drops of the sample solution onto the prism, close the cover carefully to prevent air bubbles, and spread the liquid evenly across the surface. 4. Position the instruments light inlet toward a light source or well-lit area. Look through the eyepiece and adjust the eyepiece ring for clear focus. 5. Once the blue-white boundary line is sharp and clear, read the scale value at the intersection linethis value is the Brix measurement of the sample.