- Made of transparent plastic which permits observation of a joint's axis of motion and its range of motion
- Assists in physical therapy by determining range of motion of a joint as well as evaluating and gauging recovery after surgery or physical therapy
- The 360 head has three scales calibrated to be used with the International Standards of Measurement system reads 1 increments
- Each arm is 6 inches long and has a linear scale in both inches and centimeters
- The arms remain at the last measurement position until reset