A device for determining a speed or acceleration of an electrically conductive object (4, 4c) in a predetermined movement direction, - having at least two first magnets for each producing an external magnetic field perpendicular to the movement direction and - having at least one first sensor for detecting an internal magnetic field caused by eddy currents in the object (4, 4c), wherein a measurement axis of the first sensor runs perpendicular to the movement direction and the at least two first magnets and the at least one first sensor are arranged spaced from one another in the movement direction, wherein in each case a first sensor is arranged between two first magnets in each case, - having at least two second magnets for each producing an external magnetic field perpendicular to the movement direction, which are each arranged with one of the at least two first magnets on a common magnetic axis which is arranged perpendicular to the measurement axis and perpendicular to the movement direction and wherein the first magnet and the second magnet are oppositely polarised on such a common magnetic axis, - having at least one second sensor for detecting an internal magnetic field caused by eddy currents in the object (4, 4c) which, together with the first sensor, is arranged on a common sensor axis parallel to the magnetic axes, wherein a measurement axis of the second sensor is arranged parallel to the measurement axis of the first sensor, wherein in each case a second sensor is arranged between two second magnets, and - having an evaluation device for determining a speed or acceleration of the object (4, 4c) based on the internal magnetic fields detected by the first sensor and the second sensor, in that the evaluation device is configured to receive a first measurement signal from the first sensor and a second measurement signal from the second sensor and to form a difference between the first measurement signal and the second measurement signal in order to determine the speed or acceleration. - having at least two first magnets for each producing an external magnetic field perpendicular to the movement direction and - having at least one first sensor for detecting an internal magnetic field caused by eddy currents in the object (4, 4c), wherein a measurement axis of the first sensor runs perpendicular to the movement direction and the at least two first magnets and the at least one first sensor are arranged spaced from one another in the movement direction, wherein in each case a first sensor is arranged between two first magnets in each case, - having at least two second magnets for each producing an external magnetic field perpendicular to the movement direction, which are each arranged with one of the at least two first magnets on a common magnetic axis which is arranged perpendicular to the measurement axis and perpendicular to the movement direction and wherein the first magnet and the second magnet are oppositely polarised on such a common magnetic axis, - having at least one second sensor for detecting an internal magnetic field caused by eddy currents in the object (4, 4c) which, together with the first sensor, is arranged on a common sensor axis parallel to the magnetic axes, wherein a measurement axis of the second sensor is arranged parallel to the measurement axis of the first sensor, wherein in each case a second sensor is arranged between two second magnets, and - having an evaluation device for determining a speed or acceleration of the object (4, 4c) based on the internal magnetic fields detected by the first sensor and the second sensor, in that the evaluation device is configured to receive a first measurement signal from the first sensor and a second measurement signal from the second sensor and to form a difference between the first measurement signal and the second measurement signal in order to determine the speed or acceleration.