however I feel this offer isn't real.
(is anyone able to rescue
yacy.net? their public portal isn't functioning for me)
I intended to provide a real offer, but have not checked my funds and don't know where you live or if you are able to share a shipping address.
Update from my insanity: ferromagnetic particles don't emit a magnetic field. I guess you would want a force sensor on the magnet, rather than a field probe. (Sad. I like field probes.)
If you offer stronger evidence smarter people than me will listen.
I bet searx has force measurement devices too though.