The Kent Triangular Scales Rulers are specially designed to facilitate the drafting and measuring of architectural drawings, such as floor plans and orthographic projections as the scale of such drawings are often smaller than life-size. Made from recycled plastic.

• 402 in Ratios 1:100, 200, 250, 300, 400, 500
• 403 in Ratios 1:20, 25, 50, 75, 100, 125
• 409 in Ratios 1:25, 5, 10, 20, 50, 100