Frost/Dew Point Temperature and Relative Humidity Measurements: Primary and Secondary Calibration Methods Andreia Furtado, Fitsum Zenebe, Özkan Subas, Michael Schwinghammer and Praveen Giri EPJ Web Conf., 323 (2025) 07003 Published online: 07 April 2025 DOI: 10.1051/epjconf/202532307003