I own this little boiled egg timer! It's so easy to use.
Simply drop it in the water with the eggs your boiling and wait for it to turn black. It will make a line as the eggs progress. It's so handy, because how else could you possibly know when to pull the eggs for a soft or medium boil?
Priced right and particularly handy for the beginner cook, I hope you find it as useful as I did.