MEDICALLY APPROVED PORTABLE WEIGHING SCALE WITH BMI FUNCTION The Tanita WB-100S MA is a light-weight portable scale for medical use with a weight capacity of 200kg / 31st and an easy-to read, extra-large wall-mountable display. The WB-100S automatically calculates BMI. Other features include tare and weight lock functions. The scale runs on mains (adapter included) or battery power (batteries not included) and the RS-232C output enables external data capture.