Abstract: An apparatus for demonstrating and teaching the application of transcutaneous electrical nerve stimulation to a human or animal body includes a representation of such body with receptors thereon at different sites thereof corresponding to treatment sites of different pains which could afflict the body, electronic circuits capable of visually indicating locations of pain when switched on, and electronic circuits for visually showing paths of transcutaneous electrical nerve stimulation on the body representation when a transcutaneous electrical nerve stimulator is connected to the receptors and is activated. When the correct receptors are connected to T.E.N.S. unit for the treatment of a particular visually indicated pain and the T.E.N.S. unit is turned on the indication of the pain is cancelled. Also disclosed are apparatuses with which the electrical stimulator employed is of a type other than a T.E.N.S. unit, such as bone growth and muscle stimulators.