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The document specifies testing procedures for determining calibration error for radiosonde humidity sensors sampled from a mass production batches based on varying the levels of relative humidity at atmospheric upper-air temperatures using a laboratory setup. Application of this document provides the following: In this document, the requirements for a humidity generator, a test cell, a precision hygrometer, and a thermometer as essential laboratory setups are proposed in a). In b), the test procedure including the test preparation, the installation of radiosondes in the test cell, the operation of laboratory setups, and the comparison between the reference relative humidity and the radiosonde relative humidity are presented. In c), the method for evaluating uncertainties related to the reference relative humidity and the radiosonde humidity sensor is discussed.