There are different patterns for egg storage even in Europe, with or without fridge, etc. In any case, I use the "floating egg" test every time I cook an egg. I

There are different patterns for egg storage even in Europe, with or without fridge, etc. In any case, I use the "floating egg" test every time I cook an egg. If the egg floats in water, I don't eat it. No need for a dedicated device.