A device for the electrical and visual detection of the positioning of at least one actuator drive shaft, the device comprising a. a stem associable with said shaft, b. a visual indicator of the position of the stem whereby c. rotation of the stem of the device induces a driving of an indicator disk via a magnetic coupling, d. the magnetic coupling is attained by: i. a first series of magnets inserted in a rotation pin coaxial and in mechanical connection with the stem; said first magnets being arranged coaxial with and inside a cover of the device; ii. a second series of magnets mutually positioned with respect to the first series of magnets, i.e. coaxial with and outside the cover; e. each of said two series of magnets (10, 16a) is constituted by at least four magnets with offset polarities, both with respect to those on the same side and those on the opposite sides of the cover; f. said second series of magnets is in mechanical connection with the visual indicator through the indicator-disc which contains said second series of magnets on its lower part; g. said second series of magnets abuts against one side of a corresponding concentric annular portion extending from the cover and along the axis of the device, while on the opposite side of the portion, the rotation pin with the first series of magnets is situated; and whereby h. said rotation pin is mechanically connected to the stem by means of the intermediation of a driving plate, inserted at one end in the rotation pin and at the other end in a cam in turn integral with the stem; the cam also acting as element-holder for an electrical detection group. a. a stem associable with said shaft, b. a visual indicator of the position of the stem c. rotation of the stem of the device induces a driving of an indicator disk via a magnetic coupling, d. the magnetic coupling is attained by: i. a first series of magnets inserted in a rotation pin coaxial and in mechanical connection with the stem; said first magnets being arranged coaxial with and inside a cover of the device; ii. a second series of magnets mutually positioned with respect to the first series of magnets, i.e. coaxial with and outside the cover; i. a first series of magnets inserted in a rotation pin coaxial and in mechanical connection with the stem; said first magnets being arranged coaxial with and inside a cover of the device; ii. a second series of magnets mutually positioned with respect to the first series of magnets, i.e. coaxial with and outside the cover; e. each of said two series of magnets (10, 16a) is constituted by at least four magnets with offset polarities, both with respect to those on the same side and those on the opposite sides of the cover; f. said second series of magnets is in mechanical connection with the visual indicator through the indicator-disc which contains said second series of magnets on its lower part; g. said second series of magnets abuts against one side of a corresponding concentric annular portion extending from the cover and along the axis of the device, while on the opposite side of the portion, the rotation pin with the first series of magnets is situated; h. said rotation pin is mechanically connected to the stem by means of the intermediation of a driving plate, inserted at one end in the rotation pin and at the other end in a cam in turn integral with the stem; the cam also acting as element-holder for an electrical detection group.