This combined Holmium Oxide and Neutral Density glass filter serves as a reliable tool for routine verification of both wavelength and absorbance accuracy in visible spectrophotometers. The filter integrates a holmium oxide optical glass bonded to a neutral density filter, generating a nominal 1 absorbance unit (A) background, ideal for absorbance calibration.
Mounted stress-free within an anodised aluminium holder, the filter is protected by sliding window covers that prevent surface damage when not in use. Each filter undergoes individual certification to account for subtle peak position variations inherent to glass batch variations.
This combined Holmium Oxide and Neutral Density glass filter serves as a reliable tool for routine verification of both wavelength and absorbance accuracy in visible spectrophotometers. The filter integrates a holmium oxide optical glass bonded to a neutral density filter, generating a nominal 1 absorbance unit (A) background, ideal for absorbance calibration.
Mounted stress-free within an anodised aluminium holder, the filter is protected by sliding window covers that prevent surface damage when not in use. Each filter undergoes individual certification to account for subtle peak position variations inherent to glass batch variations.
