Monitors
| Action Mfg. & Supply Inc. |
| Advanced Electronic Prod., Inc. |
| Applied Membranes, Inc. |
| Applied Water Engineering, Inc. |
| Aqua-Tronics, Inc. |
| Aquanetics Sys., Inc. |
| Aquest, Inc. |
| Arizona Instrument Corp. |
| Capital Controls Co., Inc. |
| Craig Ocean Sys., Inc. |
| Deltatrak, Inc. |
| Eco Sensors, Inc. |
| Environmental Prod. USA, Inc. |
| Gems Sensors |
| H F Scientific, Inc. |
| Hanna Instruments, Inc. |
| HM Digital, Inc. |
| Horner Discus Int'l. Inc. |
| Hydro-Check Sys., Inc. |
| IBR, Inc. |
| International Light, Inc. |
| Kentucky Water Treat. |
| Milltronics, Inc. |
| Myron L Co. |
| Neotronics of North America |
| Osmonics |
| Ozotech, Inc. |
| Pro-Flo Prod., Inc. |
| Pure Aqua, Inc. |
| RODI Sys. Corp. |
| Sprite Ind., Inc. |
| Vista Water Sys., Inc. |
| Water Tec Int'l. |
| Water Tec Tucson |
| Wood Bros. Ind. II |
|
|