Burton Egg-Per\'fect Color Changing Egg Timer
The colour changing - heat sensitive EGG-PER'FECT sits right in the pot with your eggs.
As the eggs cook, a visual color change on the graduated scale tells when they are soft, medium or hard by precisely sensing heat instead of time.

The sensor accounts for the number of eggs, the amount of water, even the altitude at which the eggs are being cooked.

Soft boiled eggs are as you like them... Every time.

Hard boiled eggs are no longer overcooked, so they have perfectly colored yolks and a smooth texture.