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Might one also use a piece of graphite rod of the kind used in mechanical pencils? Anyone know the resistance of a 0.5 mm HB pencil lead, per centimeter?
I just tried a measurement. 1 cm of 0.5mm HB rod had about 50 ohms, so it seems that one would need a very short piece, or a much wider rod, or a thin layer between 2 conductors.