Zhengzhou Zhongkong Measurement Co., Ltd predecessor for the Zhengzhou Quality Engineering supervision Bureau respective Zhengzhou measurement appliance development institute.Constructs the institute from 87 years to be engaged in the electricity measurement and the length measurement (the inside diameter table special-purpose ring gage, the horizon shows the value calibrator, the zero position calibrator; Verticality measuring instrument, square inspection tester, diffraction grating type dial gage examination meter, small angle inspection tester) and so on measurement instrumentation measuring appliance development production work.