A simple and rather effective power line monitor: get an old cheap laptop with
some sort of sound input capabilities with at least a semi-usable battery, an
AC output wall wart, and a couple of divider resistors. Record the AC line
as audio during your experiments. You can analyze the audio in real time or
after the fact. I have seen software packages that are geared specifically to
audio power line monitoring, but don't remember what they are.
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