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M«M*I The New Ultra-Fast, Ultra-easy, Ultrameters For more than 30 years, the Myron L Company has designed and manufac- tured highly reliable analytical instru- ments for a wide variety of applications. Demanding uses range from boiler water testing to ultra-pure water controls. The new Ultrameter series is affordably priced, but does the jobs of multiple instruments. Circle No. 132 Complete Marine Bulkhead System The DONN Marine Bulkhead system provides an attractive, affordable and efficient alternative to conventional join- er bulkheads. All parts of the bulkhead system interlock and are designed and built to closely controlled tolerances.This eliminates up to 80% of the labor necessary to construct conven- tional joiner bulkheads. For more infor- mation please call: 800-299-9888. Circle No. 133 Ultrameters Contucthlty TBS Resistivity pH Temperature OftP