Designed to help you make superior candy, jelly and deep-fried foods, the CDN TCG400 Candy & Deep Fry Ruler Thermometer features and 8-Inch color-coded scale with target range indications, a non-mercury column encased in waterproof, durable laboratory glass. The body and attachment clip are made of stainless steel for safety and durability. The bottom of the glass column is also enclosed in stainless steel to prevent it from touching hot surfaces that might cause inaccurate readings. 5 year limited warranty.