Optical Refractometer Calbration Procedure

Optical Refractometer Calbration Procedure

1. Begin the calibration of your refractometer by lifting up the daylight plate and placing 2-3 drops of distilled water on top of the prism assembly. Close the daylight plate so the water spreads across the entire surface of the prism without any air bubbles or dry spots.

2.      Hold the refractometer in the direction of a natural light source and look into the eyepiece. You will see a circular field with graduations down the center. You may have to focus the eyepiece to clearly see the graduations.

3.      Remove cap from adjustment screw, adjust the line between blue(top) and white(bottom) until the dividing line is even with the zero line at the bottom of the scale.

4.      Replace protective cap on adjustment screw.