Triplett WiFi Hound 2.4 GHz and 5 GHz Wireless Network/RF Spectrum Analyzer to Visualize and Troubleshoot Wi-Fi Issues for Smart Homes, Businesses, and More (WFHOUND): Amazon.com: Industrial & Scientific
2.4GHz Portable Spectrum Analyzer USB Dongle
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RF Viewer — Low-Cost, Wireless USB Dongle, RF Spectrum Analyzer