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Thermo Fisher Scientific

Photometric accuracy tests for neutral density filters USP 2015


Follow these steps to complete accurace tests for neutral density filters:

  1. Select USP 2015 in the “Select testing methodology box”.
  2. Set the Wavelength and set the absolute value of your first neutral density filter (Target).
  3. Set the Tolerance to .008.
  4. Run the test.
  5. Repeat steps 2 through 4 for the other neutral density filters.


  • Evolution 201 
  • Evolution 220
  • Evolution 260 Bio