Invented by Mr. Takao Katano A tool that can be used alone instead of the O-Ring Test. Selpho is a patented product designed to allow you to perform the O-Ring Test by yourself. It was invented by Mr. Takao Katano, a Qigong therapist and director of the Ancient Japan Healing & Dispersion Association. Originally designed to identify the location of trigger points (switches for symptom relief), it is an indispensable tool for ancient Japanese healing practices, but can be used in all aspects of life. The instruction manual has a torn fold that has been repaired with cellophane tape. Thank you for viewing.