Meters, pH
| Action Mfg. & Supply Inc. |
| Applied Membranes, Inc. |
| AquaFlow Pump & Supply Co. |
| Aquanetics Sys., Inc. |
| Barnant Co. |
| Bio-Chem Assoc., Inc. |
| Capital Controls Co., Inc. |
| Challenger Water Int'l., Inc. |
| Charger Water Treatment Products, LLC. |
| Craig Ocean Sys., Inc. |
| Deltatrak, Inc. |
| DuPage Water Treat. Prod. |
| Engineering Specialties |
| Environmental Prod. USA, Inc. |
| Faiz Enterprises |
| Filter Soft |
| Fluid Sys. & Controls, Inc. |
| GLI Int'l. |
| Great Lakes Int'l., Inc. |
| H F Scientific, Inc. |
| Hach Co. |
| Hanna Instruments, Inc. |
| Horner Discus Int'l. Inc. |
| Krevco |
| LMI Milton Roy |
| Mardon Control Sys. Inc. |
| Myron L Co. |
| New Age Water Tech. |
| Orbeco Analytical Sys., Inc. |
| Osmonics |
| Palintest |
| Precision Equip. Co. |
| Pro-Flo Prod., Inc. |
| Pure Aqua, Inc. |
| RSI Int'l. |
| Rosemont Analytical, Uniloc Div. |
| Ryan Herco Prod. Corp. |
| SERFILCO, Ltd. |
| Sprite Ind., Inc. |
| Sun Pacific Ind. |
| Taylor Tech., Inc. |
| Telatemp Corp. |
| Thornton Assoc., Inc. |
| Tintometer Ltd. (The) |
| Water Group Sys., Inc. |
| Western Water Prod., Inc. |
| Earthcrew, Inc. |
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