I'm familiar with the viewing device Techmoan demonstrated. That could be more effective, but it too cannot pick up all weak fields on all types of magnetic media (as he demonstrated in another video some time later). I doubt it would work in this case though.
I wouldn't count on the MEMS magnetometer in a smartphone to be of any use in testing this. Unless you can magnetically shield the sensor from the environmental magnetic fields (the Earth, nearby motors, transformers of electric power lines), then you will not be able to honestly say the fluctuations are purely from the vaxx site. Even am expensive and highly sensitive probe magnetometer would be of little help proving this without shielding (which in itself uses magnetic fields to counteract other magnetic fields).
Hold phone still, note any variations. Have person move vaxxed arm near it. Move unvaxxed arm. Someone else move their arm near it. That would at least establish that there is no difference in reading. Some of the apps will graph the readings. They're also pretty damn sensitive, where I can detect a ~2" dia magnet from way across the room.
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