There are good portion of us here who buys their beef already ground rather than grinding it ourselves. I have been buying mine lately from a small family owned grocery store with a very good butcher. They proudly proclaim they grind their own ground beef fresh several times a day. Just like all stores, they label their ground beef by the percentage of fat it contains.
My question is, how do they determine the beef is 80%, 85%, etc.? More importantly, how do I know if it's if it's accurate? Is there any way for me to check at home if my 85% ground beef is really 85% beef? Can you take a certain amount of raw beef and weigh it? Or should I just trust them?