PROBLEM TO BE SOLVED: To provide a temperature controller capable of surely controlling a temperature, a body temperature measuring device for a plant capable of accurately measuring a body temperature of the plant and properly gripping relationship between an atmospheric temperature and the body temperature, and a body temperature variation measuring method for the plant.
SOLUTION: This temperature controller is provided with a cooling means cooling a chamber, a thermal insulating means thermally insulating the chamber, a temperature measuring means measuring a temperature inside the chamber, and a temperature regulating means controlling the thermal insulating means according to the temperature measured by the temperature measuring means for regulating the temperature inside the chamber.
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