Physikalisch-Technische Bundesanstalt (PTB)
Research Institutes of Sweden (RISE)
VTT Technical Research Centre of Finland Ltd (VTT)
Laboratoire national de métrologie et d’essais (LNE)
Fundación para el Fomento de la Innovación Industrial (FFII)
Istituto Nazionale di Ricerca Metrologica (INRIM)
Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK)
Graz University of Technology (TUG)
Tampereen korkeakoulusäätiö sr (TAU)
AME s.r.l. (AME)
Technische Universität Dresden (TUD)
Haefely AG (Haefely)