Aluminum Triangular Scale with Graduated Markings for Architects 30cm TSBA-30KD Uses ● For drafting and reading scaled drawings I passed the 1st grade Mechanical and Plant Drafting Technician exam using this. Features ● Graduated markings for easy reading. ● Scales frequently used in architect exams. ● Total number type for quick reading of values. ● High-precision laser-printed markings. ● Symbol printing for easy face identification. Specifications ● Scale (m): 1/20, 1/50, 1/100, 1/200, 1/250, 1/300 ● Length Tolerance 1 (mm): ±0.1 ● Length Tolerance 2 (mm): ±0.2 ● Length Tolerance 3 (mm): ±0.3 ● Length Tolerance 4 (mm): ±0.4 Material ● Body: ABS Product Code 00111149 Part Number TSB-30KD Body Weight 54g Body Width 25mm Body Height 325mm Body Depth 22mm Notes ● Length tolerances are at 20°C Usage Conditions ● Length Tolerance 1: 50mm or less ● Length Tolerance 2: Over 50mm and 100mm or less ● Length Tolerance 3: Over 100mm and 150mm or less ● Length Tolerance 4: Over 150mm and 300mm or less