Then using another convex lens and a micrometer eyepiece the altered parallel rays is focused, and the imaging size of line pair of collimator imaged on the another convex lens is measured.

用一辅助凸透镜与一测微目镜进行平行光束的会聚，测出准直管玻罗板线对在辅助凸透镜焦平面上所成像的大小；

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Adopted national standards micrometer scale calibration, it can get the actual numerical size after selecting the numerical scale that corresponding to objective lens in each test.

通过国家标准测微尺标定后，每次测试只须选择与物镜相对应的比例尺数值即可直接得到样品的实际大小数值。

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