Features Accurate Reading: Professional food salinity meter. The test results are accurate, the concentration measurement range is 0~28%, and the minimum scale is 0.2%. Get Accurate Readings with ATC: Automatic temperature compensation makes it easier to get results quickly. Clear calibration, easy to read. Easy to Use:The handle is comfortable to hold and non-slip. Sturdy design, compact size, lightweight, durable and easy to use and carry, the product is packaged in the right box and easy to find when you need it. Wide Range of Applications: Ideal for home brewing, winemaking, agriculture, gardening and educational use. It is convenient to observe and measure the salinity of food. Simple to Use: Use the dropper to collect the sample and place it on the prism. Then place the refractometer under the light and observe the scale through the eyepiece to more accurately measure the salt content of the food. 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. Specifications: Measuring Range: 0~28% Minimum Scale: 0.2% Length: 17cm / 6.7inch Weight: approx. 233g Instruction: 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 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. Do not adjust it over 2cm, otherwise it will be broken. Package Included: 1 x Refractometer 1 x Screwdriver 1 x Pipette 1 x Clean Cloth 1 x Box Package List