Electrometer definitions

ĭ-lĕk'trŏm'ĭ-tər, ē'lĕk-
An instrument used for measuring voltage.
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A device for detecting or measuring differences of potential by means of electrostatic forces.
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An active circuit arrangement for measuring differences of potential without drawing appreciable current.
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A device used to detect and measure static electricity; an electroscope.
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A precision voltmeter that draws almost no current from the circuit.
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Origin of electrometer

electro- +‎ -meter