In this case, the magnet is positioned offset to the axis of the reed switch on the left, and far enough away so that the magnet will only enter the center lobe as it moves left to right. As the magnet reaches the pull-in line the reed contacts will close. As the magnet is withdrawn back to the left, the magnet will reach the dotted drop-out line. When this occurs the reed contacts will open. This represents a reed sensor cycle showing the sensing closure point and the sensing opening point. As long as the magnet is within pull-in boundary (solid lines) the contacts will remain closed. Once the magnet is withdrawn and outside the dotted drop-out lines the contacts will always be open.