This 30 cm scale ruler is crafted from durable plastic, providing a lightweight yet sturdy tool for precision measurements in architectural, engineering, and drafting projects. It’s perfect for professionals who require accuracy and reliability in their work. Scale ruler architect is extremely accurate,clear to read, fine sharp profile, nice weight to it,Ideal for architects, engineers and professional use The scale ruler is equipped with multiple scale options, making it versatile enough for a variety of architectural, engineering, and drafting applications. Whether you’re working with small or large-scale designs, this ruler ensures accurate scaling for all your projects. Scale rule includes 6 scales: 1:20, 1:25, 1:50, 1:75, 1:100, 1:125, easy to use and understand,can be easily measured from right to left or left to right Triangular scale ruler lightweight,and be supplied in a reusable rigid plastic case,easy to carry and store,ideal for ideal for cutting, professional drawing, measuring,decoration design, classroom and office use, Manufacturer: yiyuanhe