Top tips for using your Refractometer to measure colostrum quality.
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 natural light while looking down the eye piece
Always wipe the slide and glass surface clean with a clean soft cloth after a reading.