You know what it looks like… but what is it called?
TAKE THE QUIZ“Dry Bulb”
The following 2 entries include the term Dry Bulb.
dry-bulb temperature
noun: temperature indicated by a dry-bulb thermometer that is the actual temperature of the air —contrasted with wet-bulb temperature compare psychrometer
dry-bulb thermometer
noun: an ordinary thermometer
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Merriam-Webster unabridged