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This is an HP Agilent 4191A RF Impedance Analyzer. This unit has been tested and is working. The DC Bias switch is broken off inside the test port on the front end, but all components are intact. The unit powers up with an H17 error, but this is calibration and goes away once it is cal'ed.The 4191A RF Impedance Analyzer measures 14 parameters with a maximum resolution of 4 1/2-digits. The internal synthesizer provides variable frequencies from 1MHz to 1000MHz covering the UHF, VHF and video bands with automatic sweep capability.