Abstract: The proposed device comprises a primary detector and a measuring amplifier, the primary converter comprising a central cylindrical core and an external cylindrical core arranged coaxially along a longitudinal axis, a movable member being mounted coaxially with the cores, a measuring winding arranged on the central core along the longitudinal axis in such a manner that the turns of the winding encompass the central core in a transverse direction, and an additional winding having a common electrical connection point with the measuring winding and disposed on one of the cores so that its turns encompass the core in a longitudinal direction and pass through the corresponding central axial opening. The measuring winding and the additional winding are connected with the measuring amplifier, and alternating current voltage is fed to the input thereof.