Wide Applicability: From secondary school mathematics and university calculus to specialised mathematical research, this ruler meets requirements, serving as essential learning tool for every student Versatile Usage: Whether engaged in drawing, craftwork, or technical drafting, this geometric ruler adapts to diversed including paper, fabric, and wood Ergonomic Design: The ergonomic shape provides comfortable grip, facilitating prolonged use by students while reducing fatigue 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, it is durability yet lightweight for easy portability, ideal for daily study and examinations, Manufacturer: JunsenF