Abstract: A pivot hinge comprising a reed switch embedded in the leaf of a nonmagnetic pivot-jamb portion. The reed switch is located in the jamb leaf at an attitude to miss the mounting holes. A round permanent magnet is adjustably mounted on the pivot-door portion perpendicular to the door leaf. When both the door and jamb leaves are together, the magnet is positioned over the reed switch contacts. A threaded, nonmagnetic rod (adjusting screw) with a head the shape of a mounting screw is positioned adjacent the magnet in a mounting hole of the door leaf and retained in position by a retainer ring. The adjusting screw is, in turn, coupled to the magnet with a nonmagnetic link. When the adjusting screw is turned, the magnet can be moved closer to or away from the reed switch in order to actuate the switch with an adjustable sensitivity as indicated by a change in the degree of door opening or closing required to operate the switch.