A dive watch is a timepiece specifically designed for underwater activities, particularly scuba diving. It features a water resistance rating of at least 100 meters, ensuring it can withstand the pressure of deep water. Key characteristics include a unidirectional rotating bezel for tracking dive time, luminous hands and markers for visibility in low light, and a durable construction to resist corrosion from saltwater. These watches often comply with standards set by organizations like ISO (International Organization for Standardization) to ensure reliability and safety. Popular brands that produce dive watches include Rolex, Seiko, and Omega, each offering unique designs and functionalities tailored for divers.