Lev-o-gage ROM is designed to easily measure the range of motion of a patient's back or joints. Simply place the legs on the back or joint to be measured, and turn the dial so that the brass ball lines up with zero degrees. Then have the patient bend over (or bend their joint) as far as possible. Hold the Lev-o-gage ROM in place as the patient moves to avoid it from slipping or turning. Once patient has reached their full range of motion, note the reading from the brass indicator ball. A great tool for chiropractors or physicians of any kind to measure the recovery process of patients.