1. PTB : Physikalisch-Technische Bundesanstalt, German National Metrology Institute, coordinator of the project, Germany
2. BFKH : Budapest Főváros Kormányhivatala, Government Office of the Capital City Budapest, Hungary
3. CEA : Commissariat à l'Energie Atomique, Laboratoire National Henri Becquerel, France
4. CMI : the Cesky Metrologicky Institut, national metrology Institute, Czechia
5. GUM : Główny Urząd Miar/Central Office of Measures, National Metrology Institute, Poland
6. IFIN‑HH : the Institutul National de C-D pentru Fizica si Inginerie Nucleara “Horia Hulubei”, Romania
7. IMBiH : the Institute of Metrology of Bosnia and Herzegovina, national metrology Institute, Bosnia and Herzegovina
8. TUBITAK : Scientific and Technological Research Council of Turkey, National Metrology Institute, Turkey
9. ADVACAM : spin-off start-up company from Institute of Experimental and Applied Physics at the Czech Technical University in Prague, Czechia
10. BIRA‑IASB : the Royal Belgian Institute for Space Aeronomy, Solar Wind and Solar Irradiance and Radiometry Sections, Belgium
11. DTU : the Technical University of Denmark, Optical Diagnostics Group, Denmark
12. DWD : Deutscher Wetterdienst, Germany
13. IVB : Victor Babes National Institute of Pathology, Romania
14. LZH : Laser Zentrum Hannover, Germany
15. MPG MPIK : Max Planck Institute for Nuclear Physics, Germany
16. NOVA : Universidade Nova de Lisboa, Associação para a Inovação e Desenvolvimento da Faculdade de Ciências e Tecnologia, Portugal
17. NTUA : Technical University, DNA Damage Laboratory and Laboratory of Laser Remote Sensing, Greece
18. Raymetrics atmospheric LIDAR manufacturer, Greece
19. UJF CAS : The Nuclear Physics Institute of the Czech Academy of Sciences, Czechia
20. CSIC : National Scientific Research Centre, The Institute of Fundamental Physics (IFF), Spain
21. GGO : Gigahertz Optik GmbH, Germany
22. IRM : the Royal Meteorological Institute, Belgium