Meet the BeepEgg Singing and Floating Egg Timer: a handy tool that lets you prepare soft-boiled, medium-boiled, and hard-boiled eggs at home perfectly each time. It monitors the outer temperature to determine the core temperature of your eggs and sound an alert at the right time.
BeepEgg works for medium to large eggs. Just throw it into a boiling pot with your other eggs, and the rest is easy. Costs under $20 at this time.