The present invention is directed toward an apparatus and method for the accurate and uniform diagnosis and/or treatment of varying forms of pain that a person is experiencing. The apparatus is a hand-held device displaying two complimentary scales on opposite faces bearing a slidable indicator that...http://www.google.ca/patents/US6258042?utm_source=gb-gplus-sharePatent US6258042 - Visual analog scale and method of use for the diagnosis and/or treatment of physical pain
