A diving watch, also known as a diver’s watch, is a type of wristwatch specifically designed for underwater diving. These watches are built to withstand the pressures of underwater environments and come with features that make them practical and safe for divers. Key characteristics of a diving watch include:

Water Resistance: Typically, a diving watch must be water-resistant to at least 100 meters (330 feet), but many are designed to withstand greater depths, often up to 200 meters (660 feet) or more.

Rotating Bezel: Diving watches usually have a unidirectional rotating bezel with minute markings. This bezel can be used to keep track of dive time, ensuring that the diver does not exceed their planned dive duration.

Luminous Markings: To ensure readability in low light or murky conditions underwater, diving watches have luminous hands, hour markers, and often a luminous bezel.

Robust Construction: These watches are built with durable materials such as stainless steel, titanium, or high-grade plastics. The crystal covering the watch face is typically made from scratch-resistant materials like sapphire crystal.

Helium Escape Valve (for deep diving): Some diving watches have a helium escape valve to release helium gas that can build up inside the watch during deep dives in pressurized environments, preventing damage.

ISO 6425 Standard: Many diving watches adhere to the ISO 6425 standard, which sets criteria for water resistance, visibility, shock resistance, resistance to magnetic fields, and resistance to salty water.

Prominent brands known for producing high-quality diving watches include Rolex (with its Submariner model), Omega (Seamaster), Seiko (Prospex), and Citizen (Promaster), among others.