Pair of polystyrene films of different thickness, both with NIST traceability certification. Kit also includes a pair of standard polystyrene films, but without NIST traceability certification. One NIST traceable film is mounted on 2' x 4' cardstock, which enables mounting in the standard universal slide mount found in all spectrophotometers, and is the same thickness as an NIST 1921 standard film (38 microns). The second thinner NIST traceable film is cast on KBr and includes holder and mounting device. Kit includes certification of traceability to NIST 1921b frequencies, radial symmetry certification for film cast on KBr and storage cases for all films.
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