A diver's watch is a specialized timepiece designed for underwater activities, particularly scuba diving. It features a water resistance rating of at least 200 meters, ensuring it can withstand the pressure of deep water. These watches often include a unidirectional rotating bezel, which allows divers to track elapsed time safely. In addition to their durability, diver's watches typically have luminous hands and markers for visibility in low-light conditions. Many models also include features like a helium escape valve, which helps prevent damage during deep dives. Overall, they combine functionality with robust design for underwater enthusiasts.