A management data distribution apparatus has, a control unit, a buffer memory element, at least one input port, and a telecommunications output. It can be used to determine the channel quality of at least one channel by sending a single message through the first channel. The holder is adapted for movement on the base over a range of positions for convenient viewing by tall and short persons. In addition, the gatesource voltage Vgs of the charge transfer MOS transistors can be uniformed to 2Vdd. To fill the gun, water is forced into the vessel under pressure, which compresses the air bladder or the piston to retain that pressure within the water-filled vessel.