The Westcott Engineers' Protractor Ruler combines precision measurement with angle marking in one compact tool. At 6 inches (15cm), it's ideal for technical drawings, engineering sketches, and detailed design work. The dual-scale design lets you measure in both inches and centimeters, while the integrated protractor function eliminates the need for separate tools. Built to professional standards, this ruler is essential for students, architects, engineers, and anyone who demands accuracy in their work.