The CDN TCF400 Candy & Deep Fry Thermometer is designed to help you make superior candy, jelly and deep-fried foods and features a non-mercury column encased in waterproof and durable laboratory glass. Candy making requires precise temperature control for best results. Unlike water, syrup temperature does not increase in a smooth manner when it is heated syrup pauses at a certain temperature. Because of this, it is important to observe the temperature at all times when heating candy syrup. Includes stainless steel clip. 5 year limited warranty.