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So "B" is the single point we want.
Does your meter have "diode test"?
Put it in that mode, black lead to any of the metal cans, red lead to "B".
The display should show a number, not zero or "----", maybe 1000 or so.
Then push the power button until you hear it reboot (~10 seconds).
Surely you can do this? It only requires three hands.
Or maybe an alligator clip for the ground.
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