Circular Transparent Protractor with Swing Arm
Here's a protractor with full coverage all around the entire polar circle. It has a swing arm that rotates so you can make marks precisely outside the perimeter.
It looks great - slightly blue, and fits right in your pencil bag or toolbox. It's 4 inches in diameter. It's a great addition to any set of measurement supplies - quick full-circle angles marked in one placement!
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