Instruments for use in the visible region only are less subject to regulation than those used in the UV. Good practice, however, requires that they are also qualified to ensure that they are performing correctly. Starna supplies a range of Certified Reference Materials for use in the visible region.
Ideally, references should be chosen whose calibrated values “bracket” the conditions to be used for analysis.
Visible Instrument Qualification Kit
Product Enquiry
Part number: RM-1N3N5DHG
A set of robust glass reference materials for qualifying visible-only spectrophotometers for photometric accuracy and wavelength calibration.
Neutral Density Filters (1.00, 0.50 & 0.25 A) - Absorbance Accuracy, 440-635 nm. More information
Holmium Glass Filter - Wavelength Accuracy, 240 - 640 nm. More information
Absorbance References
Neutral Density Filters (440-635nm) - glass filters with absorbances from 0.04 A to 3.5 A
Metal-on-Quartz Neutral Density Filters (250-635 nm)– equivalent to NIST SRM 2031
Starna Green (250-650 nm) - wavelength and absorbance for instruments with bandwidths >5nm
Combined Holmium/Neutral Density glass (360 - 640 nm) – check absorbance and wavelength with one filter!
Combined Didymium/Neutral Density glass (430 - 890 nm) – check absorbance and wavelength with one filter!
Wavelength References
Holmium Oxide Liquid (240-650 nm) - the most widely used reference for wavelength accuracy
Didymium Oxide Liquid (290-870 nm) – useful peaks in the NIR
Starna Green (250-650 nm) - wavelength and absorbance for instruments with bandwidths >5nm
Holmium Oxide Glass (270-640 nm) – useful for routine checks
Didymium Glass (430 - 890 nm) – useful for routine checks
Starna wide-range wavelength reference (335 - 1945 nm) - 20 peaks for wavelength calibration from UV to NIR.
Starna Holmium Oxide/Neutral Density glass (360 - 640 nm) – check absorbance and wavelength with one filter!
Starna Didymium Oxide /Neutral Density glass (430 - 890 nm) – check absorbance and wavelength with one filter!
Samarium Oxide Liquid (230 – 560 nm) – narrow peaks throughout the spectrum