1. 3M Company
2. AccuWeather Inc.
3. Aeroqual Limited
4. Agilent Technologies Inc.
5. Atmotech Inc.
6. Emerson Electric Co.
7. Forbes Marshall Pvt. Ltd.
8. General Electric Company
9. Hangzhou Chunlai Technology Co. Ltd.
10. Honeywell International Inc.
11. HORIBA
Ltd.
12. Merck Group
13. PerkinElmer Inc.
14. Siemens AG
15. Teledyne Technologies Incorporated
16. Testo SE & Co. KGaA
17. Thermo Fisher Scientific Inc.
18. Tisch Environmental Inc.
19. TSI Incorporated