Features: Precise Graduation: Clear graduations marked on the ruler body ensuring accurate positioning and measurement when plotting function graphs, enhancing problem-solving efficiency. Crafted from high-strength plastic, it is durability yet lightweight for easy portability, ideal for daily study and examinations. Ergonomic Design: The ergonomic shape provides comfortable grip, facilitating prolonged use by students while reducing fatigue. Versatile Usage: Whether engaged in drawing, craftwork, or technical drafting, this geometric ruler adapts to diversed including paper, fabric, and wood. Wide Applicability: From secondary school mathematics and university calculus to specialised mathematical research, this ruler meets diverse requirements, serving as essential learning tool for every student. Specifications: Features: template ruler, perfect parabolas and complex geometric shapes. Component： Plastic Size 12.2cm x 6.8cm/4.8x2.67in Quantity: 1 or 3 Package Includes: 1/3pcs cosine rulers note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.