Definition of null instrument in English:

null instrument

Line breaks: null in¦stru|ment
(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.

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected