Description: This refractometer is a professional instrument to measure salt solutions. It features high accuracy and easy operation. Widely used for food industry to control the salt concentrations in foods and beverages.Features: A professional measuring instrument to test salinity of food. Accurate test result, 0~28% concentration measure range, 0.2% minimum scale. With automatic temperature compensation. Easy to read by the clear calibration. Convenient to use, handle is comfortable to hold and non-slip. Specifications: Measuring Range: 0~28% Minimum Scale: 0.2%Length: 17cm / 6.7inch Weight: approx. 233gInstruction: 1. Open the cover and carefully wipe the prism with a soft cloth. 2. Take a few drops of the solution to be measured, place on the detection prism, gently close the cover to avoid producing bubbles which will make the solution spread all over the prism surface. 3. Put the cover directly point to the light source or bright place, observe the field of view through the eyepiece. 4. Turn the eyepiece to adjust the hand wheel to make the blue and white line clear. The scale value of the dividing line is the concentration of the solution. 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 and soft cloth to wipe the instrument, do not put into water directly to 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. Do not adjust it over 2cm, otherwise it will be broken. Package Included: 1 x Refractometer 1 x Screwdriver 1 x Pipe