Step 1: Define the function of each instrument. Thermometer: Measures temperature. Hygrometer: Measures humidity, which is the amount of water vapor in the air. A psychrometer is a type of hygrometer. Pyrometer: Measures high temperatures from a distance by detecting thermal radiation. Penetrometer: Measures the hardness or consistency of a substance (like soil, asphalt, or food) by measuring the depth of penetration of a needle or cone.
The correct instrument for measuring humidity is the hygrometer.
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