The invention relates to electronic engineering, particularly ultrahigh frequency (UHF) engineering, and may be applied to diagnostics in phytopathology and chronic diseases in a human, based on determination of response coherent to a defined frequency from a biological object when it is sensed with UHF radiation. Objective of the claimed invention is increasing accuracy in determination of characteristic frequency of biological objects and automation of biomedical examination procedure. The set objective is solved by a method, wherein electrically frequency-controlled signal in millimetre wavelength range is formed, directed onto aimed acupuncture point or biological object surface point, reflected UHF signal carrying information of amplitudes and phases of the object in frequency retuning range is received, information of skin cover or biological object impedance in aimed acupuncture points or surface is obtained, and a value of characteristic frequency of biological object is determined, according to frequency point with maximum coherence condition, reflected UHF signal phase change, and skin cover of surface impedance change. The device according to the above method comprises a sweep frequency generator that forms electrically frequency-controlled signal in millimetre wavelength range, an unidirectional coupler oriented to reflected UHF signal and connected to miniature transceiver dielectric antenna, which energises aimed acupuncture or surface point, a measuring UHF tract whereto reflected UHF signal from biological object arrives, contact terminals with converter, connected to aimed acupuncture or surface points of biological object, a processing device for measuring information that controls the generator, receives and converts into digital codes analogue signals, which bear information of amplitude and phase of reflected UHF signal, and of changing skin cover of surface impedance, and which arrive from measuring UHF tract and from contact terminals, respect
