Only use a dry optical tissue to remove other contamination. Breakage, scratching of the optical faces, or cracking voids the certification.
Insert and remove cell based Certified Reference Materials from the instrument cell holder using the circular top, and make sure not to place side loads or twist on the cell.
ASTM E275-93 Standard Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near-Infrared Spectrophotometers
ASTM E387-84 Standard Test Method for Estimating Stray Radiant Power Ratio of Spectrophotometers by the Opaque Filter Method
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