| S.no | Company Name | Founded | Country |
|---|---|---|---|
| 1 | Innovative Sensor Technology USA Division | USA | |
| 2 | J.F. Hurlbut Company Inc. and JFH Distributing Inc. | USA | |
| 3 | ENMET | USA | |
| 4 | Cole-Parmer | USA | |
| 5 | Sensor Development Inc. | USA | |
| 6 | H-O-H Water Technology Inc. | USA | |
| 7 | Stevens Water Monitoring Systems Inc. | USA | |
| 8 | Analytical Sensors Inc. | USA | |
| 9 | Advanced Micro Instruments Inc. | USA | |
| 10 | Global Plasma Solutions | USA | |
| 11 | United Security Products Inc. | USA | |
| 12 | Van London-pHoenix Co. | USA |
