测径板一般为铝制，厚度通常为12毫米至15毫米。
Caliper board for aluminum, general 12 mm thickness is usually to 15 mm.
测径清管器到达收球筒后，拆下清管器上的测径板，若测径板没有明显变形，测径合格。
The pig to receive clear caliper ball after tube, remove the clear the caliper plate pig, if caliper board did not obvious deformation, caliper qualified.
测径板的直径取决于所测管段的内径，并需考虑到该管段的变径设计，一般为所测管段最小理论内径的95%。
Caliper board depends on the diameter of pipe diameter, and the need to consider the design of pipe diameter changes, general for the minimum 95% of the pipe inner diameter theory.
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