An object that can be sensed by a motion detector is equipped with a small, battery powered transponder. When the arm body has been inserted between a BGA and a printed wiring board, a contact electrode on the arm body is allowed to contact a target solder bump. The hydraulic fluid control circuit receives pressurized hydraulic fluid from an off-axis hydraulic fluid pump and has a plurality of fluid passages disposed in the transmission house, input member and other coupling members. The sensing element has a sensing side for receiving light and a non-sensing side which is opposite the sensing side. A set-pressure adjusting device includes a magnetic field generating mechanism which generates a magnetic field in which the permanent magnet structures cause the rotating member to rotate in the same direction. The first and second ports may be granted access in accordance with a selected arbitration protocol.