galvanometer

/ˌɡæl.vəˈnɒm.ɪt.ə/

IPA: /G AE0 L V AE1 N OW0 M IY0 T ER0/

noun
  1. 1

    A device used to indicate the presence and direction of a small electric current, especially used to detect a null or balanced condition in a bridge circuit.

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Source: https://en.wiktionary.org/wiki/galvanometer