Japanese

Place eggs, the Eggtimer, and water into a pot.
Heat them on middle (rather low) flame.
You can boil many eggs as you want.
After coming to the boil, turn down the heat.
Check the variation in color of the Eggtimer. When the variation line comes to the place remove eggs into water.

For samples, see the correlation between the color changes of the Eggtimer and the boiled egg.

*NoticeI@Take the valiation line of the Eggtimer for reference. The Eggtimer may get influenced of the flame volume and the size of the pan that you use.
In order to cook boiled eggs as just you like, try to organize the same condition as before and memorize which line is your best.

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Once try cooking with the Eggtimer and success, you can do the same every time.

Reffer FAQ

What about eggs just taken out of a refregiator?

What about the size of eggsH