1.用于測(cè)量不同管壁的厚度 For measuring the thickness of different tubes. 2.壁厚千分尺測(cè)量面組合:長(zhǎng)腰鼓面-平面(D型) Type D 3.除0-25mm(1")規(guī)格外,其他規(guī)格提供一個(gè)校對(duì)桿 A calibration rod is supplied for range above 25mm(1").