From research we know that the surface of the skin, over an acupuncture point, exerts less electrical resistance than the surface around it. This fact can be utilized to identify acupuncture points by means of electricity. The principle is simple, good quality performance, yet, a little harder.
Electricity is conducted through the body and measured.
The measuring equipment is adjusted so that it only displays the skin areas which exert less electrical resistance than the surrounding area. Such is the theory. However, experience has shown us that it is not only acupuncture points which exert less electrical resistance. Damp or defective skin areas are also detected by the measuring equipment. Each type of instrument reacts differently when taking these phenomenon into account.