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In order to solve the problem of fine and quantitative adjustment in the verification and calibration of the out of tolerance double tipping bucket rain sensor, especially for the fact that the error value is one positive and one negative in the test of large and small rain intensity (4mm / min and 1mm / min), at present, the capacity adjusting nut and positioning nut can only be adjusted by visual observation and experience, which has certain blindness and low success rate. A set of verification process is proposed, and uses infrared photoelectric sensor and stepping motor module to realize the quantitative measurement of the turnover data of the upper tipping bucket and the left and right buckets of the metering tipping bucket, as well as the automatic adjustment of the positioning nut and capacity adjusting nut, and can automatically record and upload the verification data to the upper computer. The results show that the system can effectively determine and solve the problems of tipping balance and coordination, and accumulate verification data for business personnel for subsequent analysis and processing.