Features : 1. Goniometer are perfect for physical therapy professionals, home people, and students. 2. For medical, sports therapy, research in class, and a rehab program following surgery and an accident. 3. The extendable 360-degree goniometer can observe the range of joint motion. 4. Provides a good reference point for tracking your recovery progress after knee replacement surgery and monitoring flexibility. Specifications: Size: 12 inch Material:PVC