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 different temperature ranges, indicating stages like soft ball, hard ball, and caramel. Using a candy thermometer helps ensure that the sugar reaches the correct temperature for the desired candy texture. This precision is crucial, as even slight variations in temperature can affect the final product. Proper use of a candy thermometer can lead to successful candy-making results.