It's only about $90. Could this thing be adapted to use as a small
In a word, no. magnetic mixers are able to spin a small bar magnet
in the bottom of a beaker of liquid. that’s all. For one thing, the
rotating magnet that does it, is small, centered, and rotating on
it’s own axis to power the equally centered mixing magnet. For a
magnetic tumbler, you need a rotating disk roughly the width of the
container you will use, with two or more magnets (very strong ones,
much stronger than the mixers usually need) mounted around the
periphery of that disk. And the disk will need a more powerful motor
rotating it as well.
But the magnetic mixers do have various uses, for agitating certain
plating or etching baths, or helping to dissolve various chemicals to
make fluxes, liver of sulphur solutions, and the like, without you
needing to stir it manually. In the cases of things that dissolve
only slowly, that can be pretty handy. Those stirrers with a heating
ability too, are more useful still.