The invention concerns a measuring device using an indirect permittivity measurement characterised in that it comprises two electrically conductive bodies respectively constituting a measuring probe (100) and a reference probe (200), electric supply means (300) for delivering a direct current voltage with controlled amplitude, an integrating stage (500) comprising a capacity switching system (530) and control means (400) for cyclically defining, at controlled frequency, a series of two sequences: one first sequence (T1) during which the electric supply means (300) are connected to the measuring probe (100) to apply an electric field between the measuring probe (100) and the reference probe (200) and accumulate electric loads on the measuring probe (100), then a second sequence (T2) during which the electric supply means (300) are disconnected from the measuring probe (100) and the latter is connected to the summation point of the integrating stage (500) to transfer the loads in the integrating stage (500) and obtain in output thereof a signal representing the permittivity existing between the measuring probe (100) and the reference probe (200).