In order to solve the problem that the gauge body is not perpendicular to the rail when the gauge is measured by manual gauge, a measuring method which can compensate the error is adopted in this paper. The gauge used in experiment is designed and manufactured to verify the method. This subject uses Solidworks to build its three-dimensional model, uses 3D printing to make parts and tubes as the main body of gauge gauge, in order to reduce its weight and make it easy to zero calibration. By calculating the voltage signals measured by two displacement sensors with single chip computer, the corrected gauge can be obtained, which greatly reduces the error caused by manual measurement and improves the measurement efficiency.
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