Protractor Arm Measuring Round Head Angle Finder Stainless Steel General Tool 02 Brand new and high quality. Protractor Accuracy: 1 degree. Ruler Length:100 mm. 0-180 scale, a reading of 1Dial polished, anti-glare, with the clamping screwPrecision-adjusted. Size:19.7cm x 5.7cm - 7.76inch x 2.24inch.