A system includes a utility meter housing, a power supply, a non-volatile memory, an energy storage device, and a control circuit. The converter includes a rectifier circuit, starter circuit, a driver circuit, a current sensing circuit and a transformer circuit with an optional synchronous output rectifier. The LNA is single ended and there is no transformer between the LNA and the TR switch. In accordance with another embodiment, the pressure roller includes a shaft, a silicone rubber layer extruded on the shaft using an extruder so as to surround the shaft, and foamed so as to have a number of pores, and a resin tube bonded to the silicone rubber layer while surrounding the silicone rubber layer by use of adhesive. The membrane may be used in any instance where a fixed volume of liquid needs to be measured. The incident angles of an incident light beam with respect to the mirror surfaces are equalized, and optical path lengths between the input port and the first and second output ports are equalized.