Fortunately, in 1975 the German physician Rheinhold Voll invented a method of measuring biological energy. His instrument, called an electro-dermal screening device (EDSD), makes use of the property of the meridian system in guiding the qi, and for the first time converts the qi energy of the meridians into electrical energy that can be measured in order to diagnose disease.
幸而一九七五年，德國醫生傅爾發明了檢測生物能的方法，這個儀器稱為傅爾電針系統或穴檢儀，利用經絡系統傳導氣的特性，首度將經絡的氣能量轉換成電量，加以測量，以診斷疾病。