Convenient scale for architectural drawings. Triangular scale for drawing and reading dimensions; Ideal for architectural drawings. Product Size: Length: 12.8 inches (326 mm), Width: 1.0 inches (25 mm), Height: 1.0 inches (25 mm); Product Weight: 2.1 oz (58 g); Package Size: 16.1 inches (410 mm); Width: 3.1 inches (80 mm), Height: 1/100, 1/200, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/250, 1/2500, 1/250, 1/250, 1/250, 1/300, 1Line length allowance Difference; Above 0 0.2 inches (6 mm) or below: +-0.05 mm; Exceeds 6 mm; Less than 0.09 mm; Exceeds 50 mm; Less than 50 mm; +-0.18 mm; Exceeds 120 mm; Less than 250 mm; Note: Incorrectly scaled Please do not use.