Sunbeam BFM681DQ63 Weight Tracking Body Fat Scale Sunbeam BFM681DQ63 Weight Tracking Body Fat Scale. Tempered 8mm glass platform with silver accents and 1.5 in. backlit LCD display. Measures body fat using transparent conductive film eliminating the need for stainless steel pads while still providing a conduit for BIA. Calculates hydration, BMI and muscle mass. Displays weight and change in weight for up to 4 users and accurately measures weight up to 330 lbs in 0.2 increments. FDA approved BIA, bioelectrical impedance analysis, measures body fat by passing tiny electrical impulses through the body. The electrical current reacts to fat and muscle by measuring resistance to the current. Replaceable lithium batteries included