iFrogLab 2.4G Spectrum Analyzer USB dongle from iFroglab co. on Tindie
Spectrum Analyzer Audio Usb Smart Frequency Spectrometer Tester 10-6000mhz With Rf Source Digital Power Meter Bluetooth Wifi - Spectrum Analyzers - AliExpress
Deliver Reliable WiFi with Chanalyzer + Wi-Spy
Tektronix RSA507A 9kHz-7.5GHz Portable USB Real Time Spectrum Analyzer
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