Refractometer Zero and Span Set Calibrations.

Question:

If a refractometer is tested with distilled water and consistently gives 32 degrees as the freeze point, would a certified calibration still be necessary? I am trying to understand how the refractometer could be outside of its specifications and require a certified calibration if it is consistently giving the expected reading with a control fluid such as distilled water. Also, how often does MISCO recommend that the digital refractometer receive certified calibration? Any information that could be provided is greatly appreciated!

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6275 Cochran Road, Solon OH 44139

Toll Free 866-831-1999

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