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General speaking, we cannot know the temperature of the water in kettle if you don't pour it out or touch its surface.
You might even get hurt or scald during confirmation. The kettle is made by the material which can sense water temperature.
You can tell the water temperature based on the changing-color on the kettle surface. In addition, the handle of the kettle has additional raised dots for the blind to touch them.
That is, when the Braille changed by the temperature, they will know the kettle's degree.
Chaoyang University of Technology
Wufeng District,Taichung, Taiwan