The North Jersey Media Group provides excellent food safety information in an article titled, "Take your food’s temperature correctly". The article, which was published on June 18th, highlights a Good Housekeeping Research Institute study, and shows the result of tests conducted on food thermometers:
The Good Housekeeping Research Institute tested 17 new kitchen
Most people think they can check the doneness of burgers, pork chops and chicken breasts just by “eyeballing it.” They look at it and judge the doneness by its appearance. They trust their experience. Experience is good, but it might be misleading.