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What is a goniometer?A goniometer is used by physical therapists to verify the range of motion of a patients joint. Goniometers have two arms, one movable and one immovable. The therapist places the goniometer on the joint to measure two specific points. The marks on the goniometer assist the physical therapist in measuring motion of the joint. At the beginning of physical therapy, a goniometer is used to measure a baseline range of motion for a joint. Once that is established, subsequ …