• Made out of clear heavy-guage plastic. A goniometer's primary purpose is to assist in physical therapy by determining the range of a joint's motion. Used as an ideal medical evaluation tool in different types of physical/occupational/sports therapy settings or a rehab program. This physical therapy tool ensures an excellent precision and the 360 degree protractor arm movement makes it easy to guage difficult angles. This transparent goniometer can be placed directly on a joint limb for easy observation of the joint's axis of motion and range of motion. 360 degrees of coverage in 1-degree increments. Clearly marked scales offer a variety of readings.  The linear moving arm features both inches and centimeter measurements for convenience. Physical therapy goniometer comes with a standard, calibrated head and uniform increments that conform to global ISOM benchmarks. The lightweight and durable goniometer is resistant to any wear and tear.  This tool is perfect for the physical therapist, medical student, clinician, and anybody in the healthcare sector.