EKHO H-200 Body Fat/ Body Water Monitors use a method of Bioelectrical Impedance Analysis (BIA), a highly reliable method of analyzing body composition that can be done at home in a matter of seconds. BIA is based on a person's height, weight and the strength and speed at which a safe, low-level electrical signal passes through the muscle and fat in the body. Electrodes built into the patented "foot-pads" send the signal through the body.