I don't know about you, but I hate it when I make hard boiled eggs, and end up with soft boiled eggs with a semi runny yolk becasue I have no idea how long they need to boil for. Whether you like them soft, medium or hard, this egg timer will tell you exactly how done your eggs are. Simply put the timer in the water with your eggs. The timer will gradually turn to purple indicating the hardness of your boiled egg, so you never have that problem again.