This Glass Candy Thermometer with Case is especially helpful when making hard candy, jams, and more! It is very easy to read! It has a range of 100 to 400 Fahrenheit or 50 to 200 Centigrade. The thermometer uses a non-toxic blue liquid inside it to tell the temperature. It is completely safe to use for food as it is mercury-free. It also comes with a storage sleeve to keep it safe from scratches. Finally, you can clip it onto the side of your cooking pot for convenience.