18 Inch Beam Compass Rule

Solves the problem of making perfect large circles up to 36" in diameter. This beam compass attaches to thin profile yardsticks and automatically shows figures for the radius, circumference, and area of any circle in inches or centimeters.

Country of Origin: Germany
Circle Diameter Max:   36"
Shipping Dimensions:  22.5 x 1.25 x 0.12 in

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