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This compact instrument has been designed specifically to demonstrate and test POU reverse osmosis or distillation systems. By measuring electrical conductivity it will quickly determine the parts per million/Total Dissolved Solids (ppm/TDS of any drinking water. Simply pour the sample into a permanent cell cup and press the rubber protected button. Ppm/TDS is immediately on the color-coated scale. Models without the color band dial are also available. No temperature adjustments needed.