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goniometer is a device made up of stainless steel mainly used in physical therapy

Both the arms are positioned at specific point and hash marks on the hinge helps

Goniometer Plastic 180 Degree.

A goniometer is essentially a protractor with two arms extending from it, used to measure a joint's range of motion. They're most often used in physical therapy to track the progress of a joint's movement. There are many joints you can measure using the goniometer, such as the knee, hip, shoulder, or wrist.