- Unmatched Precision: Our latest precision ruler ensures exceptional accuracy for your panel layout tasks. Simply adjust the head to your desired angle and press down on the straight line. The head can be set between 0° and 70°, locking in every 5° (plus 22-1/2° and 67-1/2°) for reliable reference angles and precise measurements. - Available in Three Sizes: Choose from 10-inch, 15-inch, or 20-inch options. Each blade edge features a laser-engraved inch scale in 1/32” increments. Maintained within a total error tolerance of ±0.004 over the length of the blade, the fine satin-finished stainless steel blade is easy to read and reduces parallax errors. - Durable Material: Constructed from high-quality stainless steel, this goniometer offers excellent durability and resistance to wear. It is resistant to rust and designed for long-term use. Exercise caution when handling the stainless steel spikes. - Versatile Applications: This round-head protractor is ideal for a wide range of uses, including engineering, angle measurement, student drawing, architectural design, carpentry, and length measurement. It's perfect for students, craftsmen, architects, and designers alike. With its precision, variety of sizes, and robust construction, this goniometer is an essential tool for anyone in need of accurate measurements and angles in their work.