MFJ-864 Cross-Needle Meter reads forward and reflected power and SWR simultaneously at a single glance. It features separate HF and VHF/UHF directional couplers, each with its own SO-239 connectors. This lets you connect your HF and VHF/UHF transceivers at the same time. You can then monitor SWR and power of either transceiver at the flick of switch. Others have a single set of connectors -- you have to plug and unplug to use separate HF or VHF rigs. Power ranges: 30/300 Watts forward and 6/60 watts reflected Each power range for each band is individually calibrated. Schottky diodes are used for best accuracy.