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A tool watch is a durable timepiece designed with a specific purpose, such as diving, piloting, or racing, as well as telling the time (IE: Mission timer).^[1] They are built to be robust and reliable in challenging environments, featuring specialized functions called complications that make them useful for their intended tasks.^[2]

• Durability and robustness: They are built to withstand harsh conditions, incorporating features like scratch-resistant cases and shock absorption.
• Functionality: They have one or more specialized functions (complications) beyond timekeeping.
• High water resistance: Essential for functions like diving
• Legibility and functional dials: They have clear dials, large and luminous indices, and often dark dials for underwater visibility.
• Practicality over ornamentation: Less focus on fine finishing and decoration, and more on performance and utility
• Additional complications: Often have one or more functions besides telling time, such as a rotating timing bezel (common on dive watches) or a chronograph (stopwatch).
• Specific use cases: Tool watches are designed for various professions and hobbies:
• Diving watch: Features a rotating bezel to time dives and water resistance.
• Pilot watch: May include a slide rule for navigation calculations.
• Chronograph: A stopwatch function used for timing motor racing or other events.

• Rotating bezel: For timing events underwater or on land.
• Tachymeter: Calculates speed or distance.
• Pulsometer: Measures heart rate.
• Slide rule: Aids in complex calculations for pilots.
• Magnetic resistance: Protects the movement from magnetic fields.

• Dive watches: Built for underwater use, with high water resistance and a rotating bezel for timing dives (e.g., Rolex Submariner, Mido Multifort).
• Pilot's watches: Often feature complications useful for navigation, like a slide rule on a Breitling Navitimer.
• Field watches: Originally designed for military use, these are typically very robust and legible (e.g., TUDOR Ranger).
• GMT watches: Include a second time zone function for travelers and professionals (e.g., Rolex GMT-Master II).

• 24-hour analog dial, typical format associated with tool watches
• Trench watch