Comment by numpad0

I think one questions that people here might be having is how is the water of correct temperature is actually prepared. Do people just know how to heat water to 60C? That sounds unlikely, doesn't it?

In traditional tea ceremony, known amount of tap water is added to boiling water. Comes out okay if protocol is punctually followed.

In more casual situations, there are buttons and lamps on electric kettles to cycle through common temperatures. That works if you are going to serve dozen guests at once.