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3/10/2017: Apogee has learned of a recent product review claiming our 500 series quantum sensors read lower than the advertised specifications. Our initial investigation indicates that when used with lights that emit exclusively below 425 nanometers, our 500 series sensor’s errors exceed the stated 5% uncertainty. We are aggressively researching this issue and pending those results will be publishing a formal product notification on our website with instructions, correction factors, recalibration instructions and/or warranty procedures within a few days.

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