Low cost USB & PC Vector Network Analyzer - MegiQ - RF Development tools
LibreVNA Portable NanoVNA Vector Network Analyzer- AURSINC Antenna Analyzer 100KHz-6GHz Measuring S Parameters | External Reference Input&Output | USB Based Type C Full Dual Port Interface: Amazon.com: Industrial & Scientific
xaVNA - A low cost two port Vector Network Analyzer - Electronics-Lab.com