B

Bhagwan Das • 4.44K Points
Extraordinary Reasoning

  • (A) Pyroheliometer : Radiation
  • (B) Calorimeter : Heat
  • (C) Planimeter : Area
  • (D) Barometer : Humidity
Correct Answer - Option(D)

Explanation by: Bhagwan Das
In all other pairs, first is an instrument used to measure the second.

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