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Dielectrics and dielectric properties of materials are defined generally, and methods for measuring dielectric properties of agricultural products are described for several frequency ranges from audio frequencies through microwave frequencies. These include measurement with impedance and admittance bridges, resonant circuits, and transmission-line and free-space methods in the frequency domain and time-domain and broadband techniques. Many references are cited that describe the methods in detail and provide data on the dielectric properties or permittivities of agricultural products.