What Is This Apparatus Used to Measure

What is this apparatus used to measure?

A) It is a lightning detector to detect lightning and the level of activity of the storm and its approximate distance.
B) It is a thermometer to measure rectal temperature.
C) It is a temperature gun to determine ambient temperature.
D) It is a digital psychrometer used to determine wet-bulb globe Temperature heat index.
E) It is a sling psychrometer used to determine wet-bulb temperature.

Correct Answer:

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