Norpro Egg Timer The perfect soft, medium or hard boiled eggs, every time! Heat sensitive egg timer changes color as the eggs cook, sensing when eggs reach their desired softness or hardness! Simply place the timer in the pan with eggs and water and watch it change color as you cook. When the color change reaches your desired spot on the scale of soft to hard boiled simply remove the eggs and enjoy! Easy to use and easy to read line markers visible throughout the cooking process. Use with one egg, or a dozen! The egg timer is able to sense and adjust whether boiling one egg or a dozen.