type: Spinal Goniometer Angle Protractor Angle Ruler Product name: 12inch transparent orthopedic angle ruler Size: Length 31.5cm/12inch Circle width 12.6cm/5inch Colour:transparent Material:PVC Package Contents: 1 x goniometer 12 inch Only the above package content, other products are not included. Note: Light reflection 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.