Daiwa CN-501V 140-525 MHz Cross-Needle SWR/Power Meter w/ SO-239 Connectors. These meters are the replacement for CN-103M due to changes to the toggle switches on the front panel have been replaced with push-button switches. The Cross-needle movement allows the simultaneous monitoring of forward power, reflected power, and SWR, all without the need of an extra calibration procedure. The meter is switchable for 20 or 200 watt full scale readings, and has a built-in lamp which can be powered from an external 13.8 vDC source. Supplied with a DC power cord, which is only required for powering the built-in lamp.