Posted by Fog Top on Mar 30, 2022; 4:00am
URL: https://www.es-forum.com/Why-does-my-RF-meter-show-the-same-readings-even-if-I-surround-it-with-aluminium-foil-tp4036801p4036802.html

Not having all the details here of your experiment I can only guess.  Your RF meter has its own antenna inside to pick up external RF waves.  When holding the meter close to metal objects you may actually be picking up the signal emitted by its own antenna.