In this case, the magnet is centered over the central and strongest lobe. When the magnet moves downward and reaches the pull-in line the reed contacts will close. As the magnet is withdrawn vertically and upwards, the magnet will reach the dotted drop-out line.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 the pull-in boundary (the 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 Once the magnet is withdrawn and outside the dotted drop-out lines the contacts will always be open. The center lobe is the strongest and will offer the greatest sensing distance when compared to the two side lobes.