Features: 3 in 1 design, this refractometer can measure the brix, salinity and water gravity quickly and accurately. Aluminum construction is lightweight, wear resistant and durable for long time use. Automatic temperature compensation, temperature ranging 10°-30°C. Rubberized grip handle, non-slip and comfortable to hold. Can test the sugar content of beer, fruit juice, the salinity and water gravity of seawater. Operating procedures: 1. Open the cover and clean the detection prism with a soft cloth. 2. Take the test solution, place it on the detection prism, gently close the cover to avoid air bubbles, and make the solution spread over the prism surface and put the instrument into the light plate. 3. Align the light source or the bright area, observe the field of view through the eyepiece, and turn the eyepiece to adjust the handwheel. 4. Make the blue-white boundary of the field of view clear, and the scale value of the boundary is the concentration of the solution. Specification: Condition: 100% Brand New Material: Aluminum, Rubber Color: Shown as Picture Measuring Range: 0-10%Brix, 0-100%Salinity, 1.000-1.070 Water Gravity Temperature Compensation: 10°-30°C Length: approx. 19.5cm/7.7in Weight: approx. 234g/8.25oz Package list: 1 * Refractometer 1 * Pipette 1 * Screwdriver 1 * Wiping Cloth 1 * Instruction 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. The adjustment range of eyepiece and hand wheel is within 2cm left or right. 6. Please allow 1-3cm error due to manual measurement, thanks for your understanding. 7. 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..