Keysight 53200 Series RF Frequency Counter: 2-channel, 350 MHz-6 GHz frequency range, SMA connectors, OCXO timebase, high accuracy and stability for precise frequency measurements.
Keysight 53210A/010/201 RF Frequency Counter: 350 MHz, OCXO Timebase, Rear Inputs, 53200 Series
Keysight 53210A/010 RF Frequency Counter: 350 MHz, OCXO Timebase, 10 Dig/s, 1 Channel, 53200 Series