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Chair scales that include a precise and accurate weighing mechanism for measuring total weight, and, usually, weight variations, during the dialysis procedure. These scales typically include a horizontal platform that is placed on the floor, a chair for the patient, and a vertical column with measuring, control, and/or display capabilities; some other scales consist of a weighing frame attached between the legs and the caster of a conventional dialysis chair, as well as a separate display unit. Dialysis chair scales usually have a weighing capacity of up to 300 kg (660 lb) and an accuracy of 50 g (0.125 lb); most of them can measure and display changes in patient weight up to 5 kg (11 lb), with an accuracy of 10 g (0.025 lb) and negligible drift. These scales may use mechanical, electromechanical, or electronic weighing technologies. Dialysis chair scales are used to monitor the weight of patients for several hours during dialysis procedures as an additional control against accumulation or loss of fluids.
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