The Marsden M-225 Chair Scale is Class III approved, 250kg capacity and lightweight. It is accurate to 100kg increments and features a large, bright display, two rear braked flip up castors and hinged armrests. It can be mains powered or used with 6 x AA batteries which last up to 180 hours from a full charge - or around 9000 weigh-ins. There is also a battery status indicator incorporated into the display. The chair comes with HOLD and TARE functions, as well as a BMI and Body Surface Area (BSA) calculator, commonly used to calculate medication dosages. The combination of BMI and BSA measurements help with providing a more complete picture of your body\'s health.