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a frequency counter
It all depends on what you're measuring the frequency of. From what I have found, you need either a frequency counter, or if it's sound, a CRO

(cathode ray oscilloscope), but a high quality one is extremely expensive, or if you have an iPod touch/iPhone and headphones with a mic, just get an app for it.
Gladometer

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11y ago

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Q: What instrument measures frequency?
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