One of the frustrations of making tea, or presspot coffee, is that boiling is rarely the correct temperature of the water. Especially for coffee and green tea, but also for other hot beverages, the water should typically be 20 degrees or more below a temperature that will set your kettle a-whistle.

It would be easy to build in a probe thermometer, which would test the temperature in the middle of the water, and to have it beep when the temperature gets to whatever you set, like a kitchen timer but for temperature.

It might be nice if it had a nice silcone-covered handle, like those fancy oven mitts.