How to operate: 1.Open the cover and carefully wipe the inspection prism with a soft cloth. 2.Take a few drops of test solution, placed on the detection prism, gently close the cover to avoid the bubble, so that the solution throughout the prism surface. 3.Align the light source or the bright place, the eye observes the market through the eyepiece, turn the eyepiece to adjust the hand wheel. 4.Make the blue and white lines of view clear, the dividing line of the scale value is the concentration of the solution. Specification: Condition: 100% Brand New Material: Aluminum, Rubber Color: Shown as Picture Measuring Range: Brix content: 58 - 90% Water content: 12-27% Baume degree: 38 - 43 degrees Brix Measurement Accuracy: 1% Length: approx. 14.5cm/5.71in Weight: approx. 227g/8.01oz Package List: 1 * Refractometer 1 x Pipette 1 x Screwdriver 1 x Instruction 1 x Cleaning Cloth Note: 1. Please use this instrument according to the instruction, be careful when using. Do not loose any connection part arbitrarily, prevent violently shock, impact and falling off. 2. Use clean and soft cloth to wipe the instrument, do not put into water directly to clean and avoid scratch of surface. 3. Storage the instrument at dry and non-corrosive place. 4. Storage the part well. 5. Please allow 1-3cm error due to manual measurement, thanks for your understanding. 6. 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. This Sugar Test Meter is Made of premium materials, lightweight, small size and portable to carry Features automatic temperature compensation High accurate and the clear calibration is easy to read The rubber handle of Brix Refractometer is non-slip, soft and comfortable to hold A professional tool to measure the moisture, sugar concentration and the baume degree of honey