Concept:The question asks us to identify the pair where the weather element and its measuring instrument do not match correctly.
Explanation:A wind vane is used to measure wind direction.
So, option A is correctly matched.
A thermometer is used to measure temperature.
So, option B is correctly matched.
A barometer is used to measure atmospheric pressure, not humidity.
Humidity is correctly measured by a hygrometer.
Therefore, the pair “Humidity and barometer” is wrong.
A raingauge is used to measure rainfall.
So, option D is correctly matched.
Hence, the incorrect match is in option C.
Answer:C. Humidity and barometer