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Laboratory monitors designed for continuous measuring and display of the resistivity and/or conductivity of water. Some units may be also capable of measuring total organic carbon (TOC) content. These monitors usually consist of an electronic measuring unit and threaded in-line sensors attached to the water pipe and connected to the measuring unit. Water purity monitors are used for assessing the quality of water in low and/or high purity laboratory water supplies; those that also monitor TOC are used to assess the level of dissolved organic compounds in very high purity water systems (e.g. high pressure liquid chromatography water supplies).
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