规格：1.000mm~200mm,
精度：±0.001mm(1~30mm),±0.0015(30~50mm),±0.002(50~80mm),±0.0025(80~100mm),±0.003(100-120mm),±0.004(120~150mm),±0.005(150~200mm).
注*可订做硬质合金钢和陶瓷光面环规。
