AI Summary This is an aluminum triangular scale (architect's scale). It is a specialized ruler used by architects, land surveyors, and others for drafting work. While typical triangular scales support six different scales, this product can be divided into three parts, supporting a total of twelve scales. Made of aluminum, it is free from warping and distortion, allowing for accurate drawing and dimension verification. High-precision graduations are engraved. #️⃣TriangularScale #️⃣Aluminum #️⃣30cm