A candy thermometer is a specialized kitchen tool used to measure the temperature of sugar solutions when making candies or other confections. 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 specific temperature ranges 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 texture and consistency. This precision is crucial for successful candy-making, as even slight temperature variations can affect the final product.