This suite of STRANASKA® reference material artifacts are intended for the calibration and/or verification of the photometric scales of molecular absorption spectrophotometers in the ultraviolet (UV), visible (VIS) and short-wave near infrared (SW-NIR) regions of the electromagnetic spectrum. Filters are available at a selected transmittance density (absorbance) up to nominal 3 absorbance units. Each filter is provided in a protective canister for storage and transportation purposes. Depending on the standard, the certification is valid for either one (1) year or two (2) years. The Certificate of Calibration for each standard includes the photometric avelength reference values and expanded uncertainties at designated wavelengths, calibration measurement conditions and instructional guidelines for use. The photometric standards are offered in both CRM and CA2M brands.