Calibration according to this standard provides direct traceability to national standards. At our Service Center in Cologne, and also at your site.
We work to the highest levels of competence in instrumentation; as members, since 1977, of the German Calibration Service (Deutscher Kalibrierdienst) we operate a laboratory accredited by the Federal Physical and Technical Institute (Physikalisch Technische Bundesanstalt - PTB) – including mobile operation. This means that our calibration can be traced back to international standards.
Our accreditation extends from DC up to the 26 GHz frequency range.
More detailed information may be found on the internet page at 
http://www.dkd.ptb.de/de/_laboratorien.htm