Secondary standards to calibrate spectrophotometers

Certified Calibration Standards ensure measurement results
Spectrophotometers only provide correct results in the long run, if they are recalibrated regularly. UV/ Vis calibration standards from the accredited Hellma Analytics calibration laboratory are traceable to primary standards of the NIST (National Institute of Standards and Technology) and thus assure the international comparability of measurement results. Internal quality requirements can therefore be met ideally.

Glass Filters: For testing spectrophotometers. Photometric accuracy and wavelength accuracy in the visible spectral region.

Liquid Filters: For testing spectrophotometers according to European Pharmacopoeia, wavelength accuracy, photometric accuracy, stray light behaviour, resolution.

Periodical Recalibration
Usually customers choose a recalibration of the solid filters every 12 months for the first two years of use and after that every 24 months, recalibration of the liquid filters not later than every 12 months. The periodicity of these intervals should be determined by the user and depends on the laboratory environment and the conditions of use.
Description Complete Set Liquid Filters
Dimensions (W x D x H) 12.5 x 12.5 x 48 mm