Advanced EMF Meter GQ EMF-390 3-in-1 EMF ELF RF Meter, Low-Band 5G Cell Tower Smart Meter WiFi Signal Detector RF up to 10GHz with Data Logger and 2.5Ghz Spectrum Analyzer

I bought one of these https://www.amazon.com/Advanced-GQ-Detector-Spectrum-Analyzer/dp/B09482NSV9 a couple of years ago. Love that thing, can only recommend. I think it costs around $100. But I'm not sure if it measures 5G well or at all.