This solid-state device made by Edmund Scientific Co. provides a meter indication of skeletal muscle activity. It is sensitive to even extremely slight levels of activity and can be used as an indication of muscle tension such as that which accompanies anxiety.
It can therefore be used to provide biofeedback information to assist a subject in learning deep relaxation. The subject simply watches the meter while trying different relaxation strategies such as postural changes and relaxing thoughts. When the meter goes down, it gives the subject ‘biofeedback’ that the subject is being successful in relaxing more completely.