This is our most common type of measurement service. Our customers return their filter sets to us on a periodic basis so that we can clean the filters and update their certified reference values before returning the filters to field service use. Recertification is preferred over removing a filter set from field service use and replacing it with a new reference standard. Repeated recertification of a filter set over time allow a run chart of the certified values to be established which is important in analytical UV/VIS spectrophotometric metrology.
