Up for sale is one used, sold as a complete, un tested and as a non working unit with options, OEM stated non working, un stripped, more than likely a bad module with noise at output, send to R&S for a flat rate repair charge featuring one R&S ZNB8 4 port 8.5 Ghz Vector Network Analyzer with B10, B4 and B1.  Note-I have a had a few of these units all with the same issue which is Noise @ output.  See photos for details and add 100.00 for shipping fedex ground within the Continental USA not including Alaska, Canada, Mexico, HI, PR or any out of country shipments.  Extra charges will apply.