| 1 | Cubic Sensor and Instrument Co. Ltd. | | USA |
| 2 | Control Instruments Corp. | | USA |
| 3 | AMETEK Process Instruments | | USA |
| 4 | Figaro USA Inc. | | USA |
| 5 | MSA Safety | | USA |
| 6 | Fox Valley Fire & Safety | | USA |
| 7 | Nova Analytical Systems | | USA |
| 8 | ENMET | | USA |
| 9 | Analox Sensor Technology Ltd | | USA |
| 10 | COSA Xentaur Corp. | | USA |
| 11 | Industrial Scientific Corp. | | USA |
| 12 | IMR Enviromental Equipment Inc. | | USA |
| 13 | QuinTron | | USA |
| 14 | Tiger Optics | | USA |
| 15 | AMETEK PI Combustion | | USA |
| 16 | Nyad Inc. | | USA |
| 17 | Weiss Instruments Inc. | | USA |
| 18 | Sierra Monitor Corporation | | USA |
| 19 | C-Lock Inc. | | USA |
| 20 | Hazardous Gas Detectors Inc. | | USA |
