Blue Jay Take a Range Check 6" Clear Plastic 140 Degree Goniometer can be used as an ideal medical evaluation tool in different types of physical therapy settings. The 6-inch goniometer ensures excellent precision and the 140-degree protractor arm movement makes it easy to gauge difficult angles. Crafted from high quality plastic, the physical therapy goniometer comes with a standard, calibrated head with uniform increments that conform to global ISO benchmarks.