Hach Hydromet
 Through the years, Hach, Hydrolab, and OTT independently built their reputations as the market leaders in various areas of water measurement equipment. The common link among these three independent companies was that they were all known as innovators in their field, and all three manufactured only the highest quality water measurement instruments
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OTT Hydromet
 For more than 130 years, OTT has been the world leader in hydrological instruments and systems. OTT offers a broad line of instruments for surface water and groundwater level measurement, the world's premier precipitation gauge, complete hydrological and meteorological stations, and software for managing entire hydrological/meteorological networks.
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Hydrolab
 For more than 35 years, Hydrolab has designed and manufactured multiparameter sondes for water quality monitoring in the environment. At the heart of Hydrolab instruments is our superior sensor technology, which ensures that the important data you collect is solid, reliable, and dependable.
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Hach Company
 Hach Company provides advanced analytical systems and technical support for water quality testing with solutions for lab, process, and field. Hach's products are in use around the world, simplifying analysis with reliable, accurate results.
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