The 5343A Microwave Frequency Counter provides automatic measurement of CW signals from 500MHz to 26.5GHz. Portable size unit with excellent input sensitivity Wide FM tolerance Maximum input : +7 dBm Impedance: 50 ohms Input Connector: APC 3.5 male with collar Designed for HP-IB systems Time Base: 10MHz crystal unit Display: 11 digit LED Resolution: 1Hz to 1MHz by front panel push button Options: 011 - Digital I/O (gpib interface) Option: 011