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Neutral density filters traceable to Nist
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| Filters are certified on an instrument which has been referenced to the latest US National Institute of Standards and Technology primary reference material SRM 2930 Optiglass has launched a significant extension to its range of Starna neutral density filters, for UV-vis spectrophotometer calibration in the visible region. Neutral density filters have played a vital role in validating the absorbance scale and linearity of spectrophotometers for over 30 years. |
| However, until now traceability to a Nist primary SRM has been limited to the 0.3-2.0 absorbance range. |
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