A media routing server is described. According to an embodiment of the invention, a conductive film is formed on a conductive plug connected to an active region of a semiconductor substrate, and on an interlayer dielectric film formed around the conductive plug. The projections are typically pyramid-shaped members extending to a peak having a small surface area to prevent the electrophoresis gel from adhering to the bottom wall. Each clamp module includes a clamp sliding block. Neither the insulating bead nor the insulating tube are located in the cross-section wherein the measurement is to be carried out.