The Global Specialties Model PB-60 is a solderless breadboard system specifically designed for educational training. Two of Global's UBS-100 Premium sockets, which provide a total of 1680 tie points, are secured to a clear Plexiglas back plate. The transparent plate provides students with a convenient view of the pin layout and bus strip pin connections on the back of the breadboard itself, thus making ideal for teaching circuit continuity. Four binding posts are provided for voltage and/or signal connections and rubber feet keep the PB-60 secure to the work area. Read Less...