Features: _x000D_ This refractometer features high accuracy and easy operation. _x000D_ A professional measuring instrument, accurate test result. _x000D_ _x000D_ Easy to read by the clear calibration. _x000D_ _x000D_ Convenient to use, handle is comfortable to hold and non-slip. _x000D_ There are three types, cutting fluid testers in different ranges and salinometer that you can choose. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Option #1 #2 #3 _x000D_ Type Cutting Fluid Tester Salinometer _x000D_ Measuring Range 0-32% 0-20% 0-100 _x000D_ _x000D_ permille _x000D_ Minimum Scale 0.2% 0.1% 1 permille _x000D_ Length 17cm / 6.7inch _x000D_ Weight(approx.) 240g 219g 245g _x000D_ _x000D_ _x000D_ _x000D_ Instruction:_x000D_ 1. Open the cover and carefully wipe the prism with a soft cloth._x000D_ 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._x000D_ 3. Put the cover directly point to the light source or bright place, observe the field of view through the eyepiece._x000D_ 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._x000D_ _x000D_ Note:_x000D_ 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._x000D_ 2. Use clean and soft cloth to wipe the instrument, do not put into water directly to clean and avoid scratch of surface._x000D_ 3. Storage the instrument at dry and non-corrosive place._x000D_ 4. Storage the part well._x000D_ 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._x000D_ _x000D_ Package Included:_x000D_ 1 x Refractometer _x000D_ 1 x Screwdriver _x000D_ 1 x Pipette _x000D_ 1 x Clean Cloth _x000D_ 1 x Box