When you get used to the microwave you have, you can hit the same spot every time. It's a formula depending on your cup, the wattage of he microwave and time.
replyI can hit the temperature I want every time on a Bosch microwave from 80s which has two power levels and a rotary, mechanical timer.
Also volume of liquid and temperature of liquid and cup.
replyI generally fill the cup to the same level, and fill it from the same source in the house in 99% of the time, so they are implicit constants in the equation, at least for me.
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