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
WiFi Spectrum Analyzer For Windows 10 PC,Mac,iPhone,iPad & Android
AIRVIEW9 Ubiquiti 802.3af Powerful Spectrum Analyzer USB 2.0 900MHz Band 900MHz WiFi Networks
Metageek Wi-Spy 2.4x USB Spectrum Analyzer, 2400x3v - WLANMall
WiFi Spectrum Analyzer For Windows 10 PC,Mac,iPhone,iPad & Android
HSA2030A Handheld Digital spectrum analyzer Portable Field Strength Meter 9kHZ 3.2GHZ AC Coupled USB interface WIFI/LAN Optional|Spectrum Analyzers| - AliExpress
Deliver Reliable WiFi with Chanalyzer + Wi-Spy
AirView2-EXT 2.4GHz low cost Spectrum Analyzer from Ubiquiti with external antenna and connector. :: ICD Group, Inc
What Can A $30 USB Spectrum Analyser Do For Me? | Hackaday