The Keysight / Agilent / HP 5343A is particularly useful in the communication field since it can tolerate an FM carrier frequency of up to 50 MHz peak to peak. It utilizes microprocessor technology, the keyboard allows you to perform various math functions to allow for such things as IF offsets. An 11-digit display is sectionalized for easy readout to 1 Hz resolution. The Agilent 5342A provides automatic frequency measurement to 18 GHz in a highly portable package.