Egg Timer: For soft- and hard- boiled eggs based precisely on temperature, not losely by time. Placed in pan with eggs, timer reacts to heat and darkens as eggs cook. Adjusts for number of eggs, amount of water, altitude. Calibrated to indicate soft, medium, hard, and stages in-between. Reviewers rave about the item and call it a must have. You just have to get used to no audible signal when done.