Question: How can you tell the doneness of a steak?
Answer: Use The Rule of Thumb
By probing the surface of the steak as it is cooking you can tell how firm the meat feels. The firmer the meat, the more well done. The art is in knowing how each level of doneness feels. Try this: Loosely touch one of your fingers to your thumb: forefinger for rare, middle finger for medium rare, ring finger for medium, and pinky finger if you like your steak well done.
The tension in your muscle below the thumb should resemble the toughness of the steak you want to cook.
But remember, the steak will continue to cook as long as 5 minutes after you remove it from direct heat. Aim for undercooked. You can't uncook a steak once it's overcooked.
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