Certified glass neutral density standards to certify UV instruments from 440 to 635 nm for accuracy and linearity to USP. Set of three certified neutral density (glass filter) standards of 0.5, 0.7, and 1.0 Abs, required to certify performance of UV-Vis spectrophotometers for the determination of photometric accuracy and linearity from 440 to 635 nm to US Pharmacopeia requirements. Traceable to NIST.
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