A tool watch is a type of watch that includes one or more functions beyond simply telling the time, providing a practical tool on the wrist. These functions, known as complications in the watch world, can vary widely, with some being common and others quite rare. While watches with basic date or calendar functions are not typically classified as tool watches, they can still serve as useful tools. Tool watches are designed to be easy to read and use, often featuring clear dials and function readouts. They were originally created for specific purposes such as scuba diving, navigation for pilots, and motor racing timing, which necessitated features like clear dials, luminous materials, and sturdy, waterproof construction. Examples of tool watches include dive watches with timing bezels and pilot watches with flight tracking tools. Digital and smartwatches are also considered tool watches due to their range of additional functions, such as timers and alarms, which are integrated at no extra cost. Overall, tool watches are valued for their functionality and durability, making them popular among those who require specific features for professional or recreational activities.