Excellent Contrast Scales - The eye-catching black and red scales of this drawing triangle maximum clarity on any background and allow precise measurements on light sheets or dark presentation surfaces for consistently accurate results. CLASSROOM DEMONSTRATION TOOL - Featuring a 32.5cm base and 23cm height,this large square set serves as an excellent tool for the classroom. Improve architectural drawing tasks and simplify teaching processes through clear and simple management during demonstration. Angle Measuring Tool: The transparent protractor function allows precise angle readings. This precision supports precise drawing and helps students and designers achieve consistent results in different applications. Reliable teaching tool: with reinforced ABS material,this drawing triangle meets the demanding demonstration needs 'teaching and withstands heavy wear,a reliable solution for teachers and students' hands-on learning tasks Improved Control: The triangular ruler is designed with a non-slip handle and a red grip area,which allows stable handling and drawing accuracy. Allows seamless execution of geometric patterns or layouts on smooth surfaces for educational and creative applications., Manufacturer: WDWDW