1.量面镶装硬质合金,更具耐磨性 With carbide measuring faces,more wearable. 2.200mm以上规格可带微动滚轮 With thumb roller for range 200mm or more. 3.可进行外尺寸、内尺寸、深度尺寸及台阶尺寸测量 Can measure OD,ID,depth and step.