Agilent 8722ES 50 MHz to 40 GHz Vector Network Analyzer w/ Option 1D5 (High Stability Frequency Reference). This unit was just calibrated in November 2012 and will come with a certificate of calibration. The Agilent 8722ES vector network analyzer allows complete characterization of RF and microwave components. The Agilent 8722ES includes an integrated synthesized source, test set and tuned receiver.