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What instrument is used to measure relative humidity?

psychrometer

anemometer

pyranometer

heliograph

Humidity is the measure of the amount of moisture in the air. A psychrometer is an example of a hygrometer. A psychrometer uses two thermometers to measure relative humidity; one measures the dry-bulb temperature and the other measures the wet-bulb temperature.

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Marek Argent wikipedia → Hygrometer

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