UV-VIS spectrophotometer calibration filters.
Holmium and Didymium multi-band calibration filters made from Schott® and Hoya® glass filters.
Didymium filters
This glass filter is designed for checking the wavelength calibration of spectrophotometers in both the visible and near infrared regions of the spectrum. The usable range is 430nm to 890nm, instruments of SBW of less than 10nm.
Holmium filters
This filter is intended exclusively for checking the wavelength of moderate to high resolution spectrophotometers.
They are custom made to order to required size and supplied either un-mounted or in anodised holders.
In addition to Holmium and Didymium filters a range of neutral density filters are also available. See neutral density filter page.
