Single Meter - Dual Element and Selector Switch, Panel-Mount RF WattmeterThe 4522 RF Wattmeter is a single-meter, two element socket unit. The second socket permits the use of a more sensitive element to measure reflected power and accurately determine VSWR. A selector switch changes the display between forward and reflected power. It's designed for power measurement in CW and FM systems that employ 50-Ohm cable or 7/8" EIA transmission lines.All models include a precision line section and either one or two 3-scale analog which give full-scale direct readings from 100 mW to 10 kW. The rack panel fits standard 19-inch equipment racks. Plug-In Elements, the same used in the Bird model 43, are sold separately. Depending on the element selected , the 4522 will cover frequencies from 0.45 to 2700 MHz. Measurement accuracy is ±5% of full scale.