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galvanometer (n.)

instrument for detecting and measuring electric current, 1801, from galvano-, used as a combining form of galvanism + -meter. Related: Galvanometric. Galvanoscope "instrument for detecting and determining the direction of electric current" is from 1832.

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Definitions of galvanometer

galvanometer (n.)
meter for detecting or comparing or measuring small electric currents;
From wordnet.princeton.edu