Not exceeds ±0.1mm at a square angle of 100mm External base point and inner scale With namespace Length side (mm): 520 Short side (mm): 265 Width (mm): 15 Thickness (mm): 1.1 Scale specifications: Front: 1 cm 1 step 50 cm, Back: Special (corner, round,薄) 长度公差:±0.2 mm cm,相当于长度±0.4 mm