Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si [EASILY DETERMINE RANGE OF MOTION] Goniometer primary purpose is to assist in by determining the range of motion of a joint. It's an easy way to gauge recovery after surgery or . [AN ESSENTIAL TOOL FOR TREATMENT] Angle rule goniometer is an essential tool for anyone who works in or is going through , sports , or a rehab program following surgery or an accident. [360 degrees of coverage in 1-degree increment]6 / 8 / 12 inch goniometer, Various scales can offer a variety of readings. [CLEAR READING] The numbers and lines on the occupational tool kit are clear and . You can easily read these numbers to plays a practical role. size:15cm,20cm,30cm Material:plastic colour:Transparent Package Contents: 3 x Goniometer Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.