This protractor has many lines radiating outward from the center, which makes the measurement of angle scales very accurate. There are three oval circular holes in the center that can be used to depict ellipses.
Protractor, Rulers
Protractor with 3 Elliptical Holes at the Center
Item No. RL-S-30
Products Size（Length-Width-Thickness）:
15cm*8.7cm*2mm
