Instructions

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Note:
Specific instructions are：First, adjust the device to make the measured object under
the most distinct state and overlay… and then photograph it, as image 1; or take
away the measured object and put the differentiation board at the same height, as
image 2. (By this time, amplification factor of the device and the eyepiece distance
cannot be changed. Otherwise, the measurement result will be inaccurate. )
Image 1：
Image 2：