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Psychrometer is a device which is used to measure
1. dry bulb temperature
2. wet bulb temperature
3. dry bulb and wet bulb temperature simultaneously
4. dew-point

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Correct Answer - Option 3 : dry bulb and wet bulb temperature simultaneously

Explanation:

  • The relative humidity is measured by a Psychrometer/ Hygrometer.  
  • A Psychrometer measures humidity by taking both a wet-bulb and a dry-bulb temperature reading.
  • This device works by comparing the difference in temperature between a wet thermometer bulb and a dry thermometer bulb, that has lost its moisture by evaporation.

Instruments  Uses  
Wind wane Wind direction
Barometer Atmospheric pressure
Tensiometer Soil moisture tension
Psychrometer/ Hygrometer Relative humidity

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