Method and apparatus for measuring a humidity value of dielectric materials

A method for measuring a humidity value F of dielectric materials using at least one microwave resonator, comprising the steps of: - for at least two resonant modes having different resonant frequencies; which have a distance of at least 0.5 GHz is, in each case a shift A of the resonance frequency which results from the difference in the resonant frequency occurring at the empty resonator and the resonance frequency occurring on filled with the substance resonator evaluated - and from the at least two shifts in the resonant frequencies of a dense independent humidity value is determined via a Feuchtekalibrationskurve.