The principle behind the instrument is based on ten representative points on a person's two hands and feet. The reaction of these points represents the state of twenty systems or organs. When needles charged with an electric current are placed on these points, the instrument will give a reading.
它的主要原理，是人的兩手兩腳都各有十個地方與體內系統或器官有關，用電針探測這些地方（代表點），就可以瞭解身體的狀況。