Easy to UsePut 2 - 3 drops of liquid sample onto the prism of this Brix refractometer, then get the reading directly through the eyepiece. No need for test tank, no measurement and calculation work, simple operation, convenient use, save your time. [Main indicators] High-precision Brix refractometer: Brix 0-90%. The Brix Meter is designed for measuring the sugar content in fruit, fruit juices, maple syrup and other sugary beverages, ideal for home brewing, farming, gardening and educational use, sugar content. ATC DesignThe refractometer adopts 10C to 30C (50F~86F) automatic temperature compensation technology, the reading is direct, fast, accurate and light in weight. Instructions: 1. Open the cover and carefully wipe the detection prism with a soft cloth 2. Drop rectifying water on the prism, turn the zero adjustment screw to adjust the dividing line to 0% of the scale, and then dry it 3. Drop the solution to be tested on the prism, close the cover to avoid the generation of air bubbles, and spread the solution on the surface of the prism 4. Align the light inlet plate of the instrument with the light source or a bright place, observe the field of view through the eyepiece, and turn the eyepiece to adjust the handwheel 5. Make the blue-white dividing line of the field of view clear, and the scale value of the dividing line is the measured value of the solution