So many things wrong with this item. The "Soft" marker is so close to the edge you can't read it accurately. It got cloudy when used a second time. It made an putrid chemical smell when in hot water. If an egg got a slight crack in it I don't think you'd want to eat the egg based on the smell of the water.Even if it worked you would need to stand over it and watch it.Some people seem to like it so maybe I had a bad one. As always, Amazon was good about a refund.