Features The refractometer has the characteristics of high precision and convenient operation. Easy to use, comfortable handle, non-slip. Professional measuring instruments, accurate test results. Easy to read with clear calibration. There are three types, different ranges of cutting fluid testers and salinometers to choose from. Features: -The refractometer has the characteristics of high precision and convenient operation. -Easy to use, comfortable handle, non-slip. -Professional measuring instruments, accurate test results. -Easy to read with clear calibration. -There are three types, different ranges of cutting fluid testers and salinometers to choose from. Specifications: Option #1#2#3TypeCutting Fluid TesterSalinometer Measuring Range0-32% 0-20%0-100 permille Minimum Scale0.2%0.1%1 permilleLength17cm / 6.7inchWeight(approx.)240g219g245g 1 x Refractometer 1 x Screwdriver 1 x Pipette 1 x Clean Cloth 1 x Box 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 eyepi. 4. Turn the eyepi 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.   Package List