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Instead of a gold leaf electrometer you may consider a "pithball"right
suspended in a uniform electric field by a conducting thread and
connected to the Faraday cup. This electrostatic voltmeter may be
more convenient than the gold leaf. No separate measurement of
polarity will be necessary, the suspended piece will turn left or
from the equilibrium, according to the sign of the charge inside the
Faraday cup. Knowing the weight (and E) you will be able to calculate
coulombs from the angle. And sensitivity will be under your control.