1. INRIM, Torino, Italy
2. Politecnico di Torino, Torino, Italy
3. PTB (former affiliation), Braunschweig, Germany
4. TKES, Isbergues, France
5. TKES, Gelsenkirchen, Germany
6. BROCKHAUS Messtechnik, Lüdenscheid, Germany
7. ABB, Ludvika, Sweden
8. AK Steel, Middletown, CT, USA
9. PTB, Braunschweig, Germany
10. BAOSTEEL, Shanghai, China
11. NIM, Beijing, China
12. WISCO, Wuhan, Hubei, China
13. NPL, Teddington, UK