CW Microwave Frequency Counter w/ built-in power meter, 50MHz-20GHz The Agilent (now Keysight) 53150A is a full-featured 20 GHz CW microwave frequency counter and power meter. It offers high performance with an ultra-wideband input that covers the RF and microwave spectrum from 50 MHz to 20 GHz. Ultra-wideband, single input from 50 MHz to 20 GHz Simultaneous frequency and power measurement with analog peaking indicator Accuracy: +/-1 LSD +/- residual stability +/-(timebase error x frequency) GPIB and RS-232 interfaces standard