The GN-200 Single-Axis Goniometer is a device that can easily
measure the degrees of rotation around a joint. The
goniometer is composed of a stationary arm that is mounted on the part
of the body that does not move, a moveable arm that is attached to the
body part on the side of the joint that moves, and a sensor that
generates a voltage output that is proportional to the angle between
the two arms of the GN-200.
Calibration: The GN-200 is calibrated by setting the GN-100
arm at 90 deg and at 180 degrees.