These EMF meters are actually pretty nice for detecting background EMF radiation.

Usually, these meters detect frequencies between 500 kHz to 5 GHz, so most of what us consumers use in homes(unless you like 60GHz Wi-Fi of course), and can detect electric fields with strengths from 30V/m to 3000V/m.

The problem is that the only meters I’ve used are industrial/scientific ones.
The consumers ones are probably much worse.