Koala Tools Ring Rulers

I had never seen one of these before, but I like the idea. It is a circle-shaped, flexible plastic ruler that easily adjusts sizes and snaps to hold the size. You can use it to draw and measure circles or 3D objects from about 2-6" in diameter, and displays diameter and arc length measurements. If you lock it at the 6" diameter mark, you can read the degrees of a circle or measure angles as you would with a math compass or protractor. Younger children could use this as a safe alternative to a pointed compass. Use one with your drafting or drawing courses as a template. This would also be a handy tool for drawing perfect circles on 3D objects. ~ Sara

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