NIST 2031 UV/VIS Photometric Accuracy Kit (10%T, 30%T, 90%T) (200-700nm)


NIST 2031 UV/VIS Photometric Accuracy Kit (10%T, 30%T, 90%T) (200-700nm)

from 2,475.00

Firefly's upgraded and improved version of the NIST-2031 UV/VIS photometric accuracy kit.

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Are you spending thousands of dollars recalibrating your calibration standards?  Do you want to stop?

How does an extra $2,000 a year sound to you?  Well if you are like most, you are needlessly spending this money on recalibrating your NIST SRM 2031 metal-on-quartz filters.  

How does three extra months of research time sound?  By buying Firefly's 2031 kit you will save the long lead times that come with re-calibration.

11 Reasons Why You Need to Buy Firefly 2031 Calibration Standards Now

  1. You save $2,000 per year in re-calibration fees.
  2. You save 3 months of research time due to having your standards in your lab at all times.
  3. You save time in having to research which 2031 kit is the best.
  4. You save having to worry about the accuracy of your calibration filters degrading.
  5. You save long lead times, because Firefly always has these filters in stock.
  6. You save your peace of mind knowing that you receive a Lifetime Warranty with each 2031 kit Firefly sells.
  7. You save having to purchase additional filters to test stray light.  FUV-1 tests for both stray light and photometric accuracy.
  8. You save by having the power to test at any wavelength from 200-700nm (ex. 241nm, 704 nm etc.)
  9. You save by getting the most stable calibration standards (see chart below)
  10. You save by getting the best tolerances.
  11. You save by having the convenience of buying right from this page.

This kits includes the following filters.  

Product Specs:

  • Optical densities: 0.04au (90%), 0.5au (30%), 1.0au (10%)
  • Wavelength Range:  200-700 nm (this kit can be used for any wavelength within this range)
  • Tolerances: FUV-0.04 (+/-0.0019 au); FUV-0.5 (+/- 0.0039au); FUV-1 (+/- 0.0042au)
  • Wavelength range: 200-700nm. Standard certified calibration points included on the certificate of calibration are 250, 280, 340, 360, 400, 465, 500, 546.1, 590, 635nm. Firefly can provide alternative points in the 200-700nm range upon request or full scan data for informational purposes. 
  • External Dimensions: 12.5 x 12.5 x 45 mm


  • Photometric accuracy in the UV and VIS range
  • Stray light performance in the UV and VIS range (Note: FUV-0.04 cannot be used for stray light)

The 2031 Kit Replaces the majority of liquid and solid-state photometric kits:

  • Potassium Dichromate
  • VIS Neutral Density Filters
  • Nicotinic Acid

Included with 2031 Kit:

  • Instruction manual
  • Certificates of calibration with NIST traceability
  • Photometric data tables are available for qualified customers. Please contact us for more information.

NIST 2031 Kit Sample Certificate of Calibration

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