A differential pressure sensor comprising: - a containment body extending along a main axis thereof and provided internally with a separation wall suitable for dividing said containment body into a first and a second cavity arranged in succession along said main axis; - a piston slidingly housed in the first cavity, so as to separate the latter into a first and a second chamber, wherein each chamber (8, 9) is in fluid communication with the outside of the containment body; said piston comprising a magnet mounted on a first axial end thereof, proximal to the separation wall; - a magnetic sensor housed in the second cavity, near the separation wall and configured for measuring the axial distance of the magnet from said separation wall and for generating a signal representing such measured distance; characterized in that it comprises: - at least one lighting element capable of emitting light radiation; - a control circuit operatively interposed between said magnetic sensor and said lighting element and configured for varying the light radiation emitted by the lighting element as a function of a variation in the representative signal generated by said magnetic sensor, so that an output signal of the sensor translates into a chromatic variation of the lighting element; - at least one interface element provided with at least one radiant surface facing outwards from the containment body and extending annularly around said main axis; - at least one optical guide extending between said at least one lighting element and said at least one radiant surface and shaped for transferring the light radiation of the lighting element to the radiant surface. - a containment body extending along a main axis thereof and provided internally with a separation wall suitable for dividing said containment body into a first and a second cavity arranged in succession along said main axis; - a piston slidingly housed in the first cavity, so as to separate the latter into a first and a second chamber, wherein each chamber (8, 9) is in fluid communication with the outside of the containment body; said piston comprising a magnet mounted on a first axial end thereof, proximal to the separation wall; - a magnetic sensor housed in the second cavity, near the separation wall and configured for measuring the axial distance of the magnet from said separation wall and for generating a signal representing such measured distance; - at least one lighting element capable of emitting light radiation; - a control circuit operatively interposed between said magnetic sensor and said lighting element and configured for varying the light radiation emitted by the lighting element as a function of a variation in the representative signal generated by said magnetic sensor, so that an output signal of the sensor translates into a chromatic variation of the lighting element; - at least one interface element provided with at least one radiant surface facing outwards from the containment body and extending annularly around said main axis; - at least one optical guide extending between said at least one lighting element and said at least one radiant surface and shaped for transferring the light radiation of the lighting element to the radiant surface.