The instant-read thermometer is an accurate choice for testing roasts, steaks, meatloaves and ground beef patties. Use it to check the temperature periodically, near the end of the suggested cooking time. Most models register the internal temperature in about 15 seconds. Check the stem for an indentation indicating how deep it must be inserted into the meat for an accurate temperature reading. Dial-type thermometers must penetrate about 2 inches.
Most digital thermometers read the temperature at the tip.
Test your thermometer occasionally for accuracy.