[ DETERMINE RANGE OF MOTION] Goniometer primary is to assist in by determining the range of motion of a joint. It's an to gauge recovery after surgery or . [AN TOOL FOR TREATMENT] Angle rule goniometer is an tool for anyone who works in or is going through , sports , or a rehab following surgery or an accident. [ of coverage in 1-degree increment]6 / 8 / 12 inch goniometer, Various scales can a of readings. [CLEAR READING] The numbers and lines on the occupational tool kit are clear and accurate. You can 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.