A Perfect Egg with color-changing indicator visibly shows when eggs are perfectly cooked for soft, medium, and hard-boiled, without underdone or overdone yolks. Unlike traditional hourglass or mechanical timers, Perfect Egg uses heat rather than time to sense when eggs are cooked. The unique color-changing indicator heats up in the water at the same time as the eggs. Its gradient scale changes from red to white while eggs cook to visibly show when eggs are cooked to perfection. There's no mechanical gadget to set or guessing how long to boil eggs. Simply add Perfect Egg in with the cooking water and eggs before heating the water, then cook until the color sensor matches the desired doneness.