The holmium glass filter is suitable for use as a wavelength reference material in the UV and visible regions of the spectrum (240 nm – 640 nm). Unlike the liquid cell, however, It is not adopted by all the Pharmacopoeias for wavelength qualification.
It is accepted by the following bodies:
United States Pharmacopoeia
American Society for Testing and Materials
Therapeutic Goods Administration (Australia)
The spectrum shows 11 characteristic and well-defined peaks covering the wavelength range from 240 nm to 640 nm.
Approximate peak wavelength values (in nm) are:
242, 279, 288, 334, 361, 419, 446, 454, 460, 537, 638
A Certificate of Calibration and Traceability and full instructions for use are provided with each Reference Material. Starna Scientific is accredited to both ISO Guide 34 (4001) as a Reference Material producer, and ISO 17025 (0659) as a Calibration Laboratory for optical reference measurements. Starna offers a Lifetime Guarantee on all its Reference Materials.