From their website: 

• HIC Roasting Deep Fry Thermometer ensures the correct oil temperatures so that foods cook properly inside and fry to a crispy golden brown outside
• Made from glass with heat-resistant knob handle; easy-read face with protective sheath and safe temperature guide; food safe
• Reads temperatures from 100 to 390-degrees Fahrenheit; perfect for deep frying doughnuts, French fries, fish, chicken, candy making, jelly, and more
• Clip inside pot with point 2-inches into candy or oil without touching the bottom, cook food according to recipe
• Clips to pot for hands-free use; temperatures in Fahrenheit and Celsius; compact for easy storage; hand wash in warm, soapy water