UV standard lifespan or expiration






Our recommendation would have the White UV Standard validated at HunterLab Reston Service at least once every three years. Correct usage is to only use the spot labelled 3 to do the UV Calibration. Only use spot labelled 4 if there is ever doubt about the validity of spot 3. We would not recommend checking with spot 4 more than once every 6 months. Repeated checking of spot 4 will cause it to age at the same rate as spot 3 and diminish its usefulness as a reference check.



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