You don’t need to bother. I tried myself with a rare earth magnet, and as expected, it didn’t work. Besides, a lot of the videos are using refrigerator magnets. The whole premise is absolutely moronic.
Oh, I’ll Bother. I have a Foerster Scientific 1.069 digital Permeability Probe (Magnetoscop) at work.
I can measure magnetism to 4 decimal places in real time. If there is ANY present, I will see it on the scope.