Description Parallel Ruler The 15-inch (38.1 cm) Parallel Ruler is a basic parallel ruler without a protractor scale. Ideal for teaching applications, this clear acryllic & aluminum parallel rule is used to plot a course from a compass rose on a chart. 15-inches (38.1 cm) long Brushed aluminum arms Polished aluminum handle Milled acrylic with beveled edges No protractor scale Protective plastic sleeve
