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.
Manufactured within an ISO 9000 quality environment and calibrated in the company's own ISO 17025 accredited calibration laboratory, the new filters are certified on an instrument which has been referenced to the new Nist (US National Institute of Standards and Technology) primary reference material SRM 2930 (Starna equivalent set RM-D1D39N).
As John Hammond, Starna's technical and marketing manager for analytical products, explains: "This development means that customers who wish to work at higher absorbances, to avoid a dilution step in their procedures, can now qualify their instrument via a traceable route - an essential requirement, in many regulated environments.
"As we now offer a wide choice of 16 certified filters covering the range 0.1-92%T (0.035-3.0A), users can select exactly the right one for their particular application".
