All photometric measurements are traceable to NIST SRM 2031, 930, 1930, 2930, 1935a and/or other applicable NIST SRMs, as required

All wavelength measurements are traceable to NIST SRM 2034 and/or other applicable NIST SRMs, as required

All stray light measurements are traceable to NIST SRM 2032 and/or other applicable NIST SRMs, as required

A high level of agreement between corresponding transmittance scales maintained by NIST and Refalon was established in accordance with BIPM provisions.