The alarm manager display in a distributed network management system is arranged to have two modes of operation. A distance between adjacent lens units change during zooming so that a distance between the fourth lens unit and the fifth lens unit at a telephoto end is shorter than the distance at a wide angle end and a distance between the fifth lens unit and the sixth lens unit at the telephoto end is longer than the distance at the wide angle end. The probing device comprises a power supply and at least two conductive elements. Each of the opposing sidewalls in the first pair includes an engagement shoulder on the interior surface thereof, the shoulders being located and sized to engage the projections thereby securing the sizer about the post.