Fig. 2. The custom built, educational BIA device and hand-held electrodes used in the laboratory activity. The electrodes are made from conducting tape, banana jacks, and plastic tubing. During a measurement students hold the two electrodes, which are connected with long leads to the device, with their arms outstretched at chest level. A battery-powered voltmeter is connected to ground and either Vphase or Vmag. (See Fig. 3 for the block diagram of the device.)