Weems & Plath 12” Parallel Ruler #140 with Brushed Aluminum Arms

These navigator/'s parallel rulers are inscribed with full 180? protractor markings.The middle of the bottom edge forms the protractor center when the arms are closed.This tool combines the essential features of a protractor plotter and a basic parallel ruler.Allows courses to be measured from a convenient meridian.Made of extra strong, crystal clear acrylic.Sh.Wt.1 lb.12 Brushed Aluminum Arms12 length, 0.22 thickness, aluminum handle.'