1. AP Sensing GmbH
2. Avencom
3. Baker Hughes Company
4. Bandweaver
5. Expro Group
6. GESO GmbH
7. H&B Sensors Ltd.
8. Halliburton Energy Services Inc.
9. Littelfuse Inc.
10. Luna Innovations Incorporated
11. OFS Fitel
LLC. by The Furukawa Electric Co. Ltd.
12. Omicron Electronics GmbH
13. Optromix Inc.
14. PACIFIC MICROSYSTEMS
15. Patol Limited
16. Precise Downhole Solutions Ltd.
17. Prysmian Group
18. Schlumberger Limited
19. Sensornet Limited
20. Silixa Ltd.
21. Sumitomo Electric Industries
Ltd.
22. Tempsens Instruments (I) Pvt. Ltd.
23. Weatherford International PLC
24. Yokogawa Electric Corporation
25. Ziebel