Determine the herd’s individual cut-off limit and implement a colostrum strategy that uses the best possible colostrum available in the individual herd. A Brix value of 22% corresponds to 50 mg/mL, meaning colostrum with a Brix value above this cutoff point can be considered high quality colostrum.
Refractometer should be kept free from any visual dirt
Calibrate the Refractometer using distilled water before each use.  If the scale does not read zero (i.e. at the bottom of the blue section) adjust using the calibration screw
Hold the refractometer up yo natural light while looking down the eye piece
Always wipe the slide and glass surface clean with a clean soft clothpfter a reading