see candy/fat thermometer
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.
Millions of people get sick from undercooked food each year— many chalk it up to a stomach bug or the flu, but oftentimes the cause is the food in your own home. Using a thermometer makes sure you’ve killed those pesky bacteria lurking in your food.