When you are using a meat thermometer to check for doneness, insert it in the thickest part of the meat. If you’re cooking meat on the bone, make sure the thermometer isn’t touching bone—it’s a conductor of heat and could give you a false reading. Also, know your temperatures. The USDA’s recommended safe minimum internal temperatures are as follows: beef, veal, lamb and pork (steaks and roasts), 145°F; fish, 145°F; ground beef, 160°F; poultry, 165°F.