In biofeedback are used devices which can provide a stream of information about your biological functions.
Use one each time or a combination, in special cases, during your biofeedback training. A special electronic thermometer, able to monitor both increase and decrease of your temperature, instantly, and give readings in tenths or hundredths of a degree, is a basic biofeedback instrument.
With this thermometer you can measure the temperature of certain body parts and observe under which psychomental conditions your temperature raises or falls and to what level, thereby draw valuable conclusions regarding the operation of your thermoregulatory system.
A device measuring muscular tension appearing in some part of your muscular system, an electromyograph, is another useful device in biofeedback training. This device allows you to locate in which body part develop tensions during any of your activities.
A demographer, showing the changes occuring in galvanic (electric) resistance of your skin, which are directly contingent upon your psychomental state, is another basic biofeedback tool and gives information about your psychoemotional state, during any of your actions.
Electroencephalograph, a device that records your the operation of the brain during any of your activities, is yet another instrument used in biofeedback.
A simple medical manometer measuring your blood pressure during your activities could also be a useful biofeedback tool.
A device monitoring your pulse could also prove ancillary in biofeedback training, since it can provide you with information on heart beat variability, such as tachycardia, slow heart rate or arrhythmia, which might occur during any activity.
Every device measuring biological processes and parameters in the human organism can be utilized as a biofeedback instrument and be included in biofeedback protocols, depending on the problem we tackle.