Uploaded December 2018 | Updated September 2026, 3 weeks ago

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I test many different potential RF shielding materials for effectiveness both with and without grounding.

Below is a summary of the readings demonstrated in the video.
mm/no ground/grounded
Aluminum foil .05 / 1.62 / 1.53
1" Foil insulation board .4 / 1.87 / 1.56
Aluminum sheet .5 / 1.20 / 1.1
Copper sheet .5 / 1.67 / 1.63
Copper mesh screen 1.22 / 1.17
Lead sheet .3 / 1.88 / 1.76
Steel pizza pan .8 / 1.77 / 1.37
Stainless steel tray 1.7 / 1.22 / 1.41
9/16" OSB wood panel 14 / 6.0
Sheetrock wall 1.44

(sorry if the numbers are hard to read, I tried several times to get them aligned like a chart but as soon as I save it and go back, everything is misaligned again)

See the companion introduction video here: youtu.be/fIf3SqKi1t0

See my other videos measuring the RF frequency levels of everyday products on my playlist: youtube.com/playlist?list=PLwvM5FrPTJTn5N9V0FU3UElo3c3otTRT-