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.
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%。
When installing the drain, use an inner diameter of 10 mm above the pipe, the length can not exceed 5 meters, not to bend the pipe up. (Below)
安装排水管时，要用内径10毫米以上的管子，长度不能超过5米，不要使管子向上弯。（如下图）
In this paper, a photoelectric instrument for measuring inner diameter of steel pipe is introduced, in which the linear CCD is used as sensor, and 8031 monolithic computer as master control system.
介绍了一种检测细长钢管内径的光电检测装置。该装置利用线阵CCD作传感器，采用8031单片机作为主控制。
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