Instrumentation, Field Use
| Action Mfg. & Supply Inc. |
| Applied Membranes, Inc. |
| Aquanetics Sys., Inc. |
| Craig Ocean Sys., Inc. |
| Engineering Specialties |
| GLI Int'l. |
| H F Scientific, Inc. |
| Hach Co. |
| Hanna Instruments, Inc. |
| Hudson Corp. of Texas |
| Hydro-Check Sys., Inc. |
| IBR, Inc. |
| ITT Barton |
| International Light, Inc. |
| Kentucky Water Treat. |
| Myron L Co. |
| New Age Water Tech. |
| Odessa Engineering |
| Orbeco Analytical Sys., Inc. |
| OREC, An Osmonics Co. |
| Palintest |
| Sprite Ind., Inc. |
| Taylor Tech., Inc. |
| Thornton Assoc., Inc. |
| Tintometer Ltd. (The) |
| Visual Inspection Tech., Inc. |
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