The body composition monitor works by sending a small, imperceptible electrical signal through the whole body, from arm to foot, to calculate total body water. Omron's Full Body Sensing takes measurements from both hands and feet creating a more accurate reading by reducing the influence of water movement throughout your body. Typically, these types of measurements could only be taken by a doctor or physical trainer, but with Omron you can get them at home anytime you want. Features: Measures 7