Frequency meter

Rarity: Common

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Notion

Domain

Science and technology

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What Wikipedia says

A frequency meter is an instrument that displays the frequency of a periodic electrical signal. Various types of mechanical frequency meters were used in the past, but since the 1970s these have almost universally been replaced by digital frequency counters.

Excerpt from the Wikipedia article “Frequency meter”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Julo, Public domain, via Wikimedia Commons.