SPA-3G Combo RF Explorer and Spectrum Analyzer with a Heavy Duty case Portable Handheld Digital Ham-Radio-Network-Audio-Signal Frequency Analyzer - Software Included (Up to 2.7GHz): Amazon.com: Industrial & Scientific
Spectrum Analyzer 35M-4400M Big LCD Screen Wireless Signal Detector for Radio WiFi GSM Camera Search Full-Range RF Detector _ - AliExpress Mobile
RF Viewer — Low-Cost, Wireless USB Dongle, RF Spectrum Analyzer
Inexpensive RF Spectrum Analyzers for Wireless Mics!
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