| 1 | Campbell Scientific Inc. | | USA |
| 2 | Marshall-Browning International Corporation | | USA |
| 3 | NovaLynx Corporation | | USA |
| 4 | Texas Electronics Inc. | | USA |
| 5 | All Sensors Corp. | | USA |
| 6 | Lufft USA Inc. | | USA |
| 7 | Coastal Environmental Systems | | USA |
| 8 | Mesotech International Inc | | USA |
| 9 | Sutron Corp. | | USA |
| 10 | All Weather Inc. | | USA |
| 11 | RainWise Inc. | | USA |
| 12 | Etgage Co. | | USA |
| 13 | Eme Systems | | USA |
| 14 | Davis Instruments | | USA |
| 15 | Global Water Instrumentation Inc. | | USA |
| 16 | Arable | | USA |
| 17 | SensaTronics | | USA |
| 18 | Optical Scientific Inc. | | USA |
| 19 | IFM Efector Inc. | | USA |
| 20 | Innovative Sensor Technology USA Division | | USA |
| 21 | Columbia Weather Systems Inc. | | USA |
| 22 | ControlByWeb | | USA |
| 23 | GENEQ Inc. | | USA |
| 24 | Lockheed Martin Corporation | | USA |
| 25 | Kestrel Instruments | | USA |
| 26 | Dwyer Instruments Inc. | | USA |
| 27 | Measurlogic Inc. | | USA |
| 28 | Maximum Inc. | | USA |
| 29 | Kumbaya Inc. | | USA |
| 30 | QinetiQ North America | | USA |
| 31 | Warren-Knight Instrument Co. | | USA |
| 32 | Kintech Engineering | | USA |
| 33 | Michigan Aerospace Corporation | | USA |
| 34 | Chaney Instrument Co. | | USA |
| 35 | MicroStrain a LORD Company | | USA |
| 36 | Stevens Water Monitoring Systems Inc. | | USA |
| 37 | OTT HydroMet | | USA |
| 38 | Vaisala Inc. | | USA |
| 39 | Onset Computer Corporation | | USA |
| 40 | Weather Scientific | | USA |
| 41 | E+E Elektronik Corp. | | USA |
| 42 | R M Young Company | | USA |
