A candy thermometer is a specialized kitchen tool used to measure the temperature of sugar solutions when making candy. It typically features a glass or metal tube filled with liquid that expands and rises as the temperature increases. The thermometer usually has a scale marked with temperature ranges suitable for different types of candy, such as soft ball or hard crack stages. Using a candy thermometer helps ensure that the sugar reaches the correct temperature for the desired candy texture. This precision is crucial because even slight temperature variations can affect the final product. Proper use of a candy thermometer can lead to successful candy-making, whether for caramels, fudge, or hard candies.