A.2.7~3.1mm B.2.8~3.2mm C.2.9~3.2mm D.2.7~3.2mm
A.57~61mm B.58~62mm C.59~62mm D.58~60mm
A.游標卡尺,壁厚千分尺 B.游標卡尺,百分表 C.千分尺,百分表 D.百分表,驗棒