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Goniometer medical rules protractor made of plastic perfect for hospital pharmaceutical or medical clinic ect size 17.2cm x 3.5cm x 1.9mm goniometer is a device made up of stainless steel mainly used in physical therapy for measuring range of motion of joint . It has two arms in it . One arm is fixed and other one is movable . It is basically made for properly trained professionals who have knowledge of using it . Both the arms are positioned at specific point and hash marks on the hinge helps the professional to measure the range of motion .