Compass/protractor combination can be used to as a compass to create circles, as an accurate spinning protractor and as a ruler with straight edges having scales in inches/mm.
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Draw it all with this remarkable combination protractor, compass and straight edge ruler. Circles from 10 mm (2/5") to 120 mm (4¾") can be created in 1-mm (1/16") increments. Includes accurate spinning protractor, with straight edges having scales in inches/mm.