Disclosed is a carboxyl group-containing polyurethane containing a structure derived from a polycarbonate diol, the polycarbonate diol having: a number-average molecular weight of 500 to 50,000; an alkylene group of 8 to 18 carbon atoms in its structure; and hydroxyl groups at both ends. Methyl methacrylate is added to a linear polysiloxane and polymerized in a predetermined molding cavity, and methyl polymethacrylate is formed on at least the surface of the molded silicone rubber. A filter element is arranged in front of the outlet orifice. Each probe is mounted to a support structure around a common reference point and is a component of a different measurement or fault isolation tool. The ground plate improves integrity in a high-speed signal by canceling the complex impedance of a bond wire.