Definition of null instrument in English:

null instrument

Line breaks: null in¦stru|ment

Entry from British & World English dictionary

(also null indicator)

noun

An instrument used to measure an electrical quantity by adjusting known quantities in the circuit until a reading of zero is obtained.

Definition of null instrument in:

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Word of the day neoteny
Pronunciation: nēˈätn-ē
noun
retention of juvenile features in the adult animal