EduGoog
Choose or find odd pair of words

(Pyroheliometer : Radiation) , (Calorimeter : Humidity) , (Planimeter : Area) , (Barometer : Humidity)

Option:
A. Pyroheliometer : Radiation
B. Calorimeter : Humidity
C. Planimeter : Area
D. Barometer : Humidity
Answer: D . Barometer : Humidity

Justification:

In all other pairs, first is an instrument to measure the second.

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