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Several characteristics of stock and water flows to and around a paper or board machine are often monitored and or controlled for multiple reasons including one, to ensure a consistent flow of stock to the paper or board machine. Two, to optimize run ability of the machine and prevent process upsets including sheet breaks. Three, to optimize the efficiency of chemical additives and the results of various processes including refining, and four, to produce a consistent high-quality sheet of paper or board with the desired sheet characteristics. The following characteristics are often monitored, pH, consistency, temperature, fiber size distribution, freeness, and charge demand.