<p>This 30cm triangular scale ruler is a professional drafting tool designed for architects, engineers, and designers. With six precise scales, it simplifies multi-ratio drawing tasks, ensuring accurate measurements every time.</p><ul> <li>Six scales on one tool cover common ratios from 1:20 to 1:500, reducing the need for multiple rulers.</li> <li>Precision-etched markings are clear and wear-resistant, maintaining accuracy over heavy use.</li> <li>Sturdy, lightweight construction resists bending and breakage for long-lasting reliability.</li> <li>Non-toxic, odor-free materials make it safe for daily professional and educational use.</li> <li>Triangular shape fits comfortably in hand, allowing for stable, controlled strokes.</li> <li>Classic finish with smooth edges prevents snagging on paper and enhances glide.</li> </ul><p>Ideal for technical drawing, blueprint reading, and scale modeling, this ruler is a dependable companion for any precise measuring task.</p>