The light and portable 6876 medical scale features Body Mass Index, battery or AC power, concealed wheels for quick mobility, padded retractable armrests, and a 24" x 24" (61cm x 61cm) square non-slip rubber mat platform. These chair scales are a hybrid standing/sitting machine. The seat flips up and down easily to allow weighing in a standing or sitting position depending on the comfort of the patient. It's equipped with retractable armrests for ease in transferring patients to the chair scale and to accommodate patients with casts. The flip-up armrests of these medical scales double as handgrips for stability when weighing in a standing position.