Which one of the following pair is not correctly matched

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Which one of the following pair is not correctly matched?

A. Odometer ⟺ Measuring instrument for distance covered by motor wheels

B. Ondometer ⟺ Measuring instrument for frequency of electromagnetic waves

C. Audiometer ⟺ Device for measuring sound intensity

D. Ammeter ⟺ Measuring instrument for electric power

Answer: Option D

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