Analyzers
| Applied Membranes, Inc. |
| Aqua Care Sys., Inc. |
| Arizona Instrument Corp. |
| Capital Controls Co., Inc. |
| DuPage Water Trate. Prod. |
| Engineering Specialties |
| Environmental Prod. USA, Inc. |
| GLI Int'l |
| H F Scientific, Inc. |
| Hach Co. |
| Hanna Instruments, Inc. |
| Horner Discus Int'l. Inc. |
| IBR, Inc. |
| Myron L Co. |
| Orbeco Analytical Sys., Inc. |
| Palintest |
| Pure Aqua, Inc. |
| Rosemont Analytical |
| S.M.M. Inc. |
| Sensidyne, Inc. |
| Tytronics Inc. |
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