There are a few ways to tell if an egg has been hard-boiled, but not many to tell if it is "perfectly" boiled. However, it's worth noting that while it is possible to over-boil an egg, it takes about an hour to do so, so if you want to be extra cautious, you could boild the egg for 15-20 minutes, but that level of caution is probably not warranted.

If you want to know techniques for telling the difference between regular eggs and hardboiled eggs, you can try the spin test:

Spin the egg on a flat surface, stop it as briefly as possible, and let go. If it starts spinning by itself after you stop it, then it is not hard boiled; if it doesn't start spinning again, then it is.

The reasoning for this is that in a non-hard-boiled egg, the yolk will continue to spin after you stop the shell, which is why it continues to re-spin afterward. This trick does take a little bit of practice to get right though.

Other tests include:
* Shine a flashlight through the egg. A hard boiled egg will look dark and opaque, but a raw egg up will light up.
* Put the egg in hot water. Raw eggs produce a stream of air bubbles and boiled eggs don't.
* Shake the egg gently. A hard boiled egg feels solid, but the weight will shift inside if it's raw.
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