| Number | Partner | Comment | Full name | Country |
| 1 | PTB | Coordinator and funded | Physikalisch-Technische Bundesanstalt | Germany |
| 2 | CMI | funded | Cesky Metrologicky Institut Brno | Czech Republic |
| 3 | IMT | funded | Institut za Kovinske Materiale in Tehnologije | Slovenia |
| 4 | LNE | funded | Laboratoire national de métrologie et d'essais | France |
| 5 | RISE | funded | RISE Research Institutes of Sweden AB | Sweden |
| 6 | CERN | funded | European Organization for Nuclear Research | Europe |
| 7 | FCT-UNL | funded | Faculdade de Ciências e Tecnologia Universidade Nova de Lisboa | Portugal |
| 8 | VACOM | funded | VACOM Vakuum Komponenten & Messtechnik GmbH | Germany |
| 9 | INFICON AG | unfunded | INFICON Aktiengesellschaft | Liechtenstein |