3-Piece Goniometer 6/8/12 Inch Occupational Protractor Tool Measuring Angle Ruler Universal

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.