electrometer

[ih-lek-trom-i-ter, ee-lek-]
noun
a calibrated device used for measuring extremely low voltages.

Origin:
1945–50; electro- + -meter

electrometric [ih-lek-troh-me-trik] , electrometrical, adjective
electrometrically, adverb
electrometry, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
electrometer (ɪlɛkˈtrɒmɪtə, ˌiːlɛk-)
 
n
an instrument for detecting or determining the magnitude of a potential difference or charge by the electrostatic forces between charged bodies
 
electrometric
 
adj
 
electro'metrical
 
adj
 
electro'metrically
 
adv
 
elec'trometry
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
Encyclopedia

electrometer

instrument designed to measure very small voltages and currents. The quadrant, Lindermann, Hoffman, and Wulf electrometers measure electrical potential between charged elements (e.g., plates or fine quartz fibres) within the housings of the electrometer. The sensitivity of these instruments is about 0.01 volt.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The remaining positively charged particles are collected on a filter inside an electrometer, where the charge is measured.
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