Taking the guesswork out of boiling eggs, the Egg-Perfect egg timer ensures your eggs will be cooked exactly as you like them. Place the timer in the pot with your eggs and begin to boil. The colour-changing interior is specifically designed to indicate when your eggs are soft, medium and hard. Because the timer sits in the pot with the eggs, it can account for the amount of water, the number of eggs, and even the altitude you cook at.