- MISTRAS Group
- SGS Group
- Fujifilm Corporation
- Olympus Corporation
- Bureau Veritas S.A.
- GE Measurement and Control
- Nikon Metrology Inc.
- Intertek Group Plc
- Applus Services
S.A.
- Acuren Inspection Inc.
- TEAM Inc
- YXLON International GmbH ( COMET Group)
- T?V Rheinland AG
- Magnaflux Corp.