A diver's watch is a specialized timepiece designed for underwater activities, particularly scuba diving. These watches are built to withstand high water pressure and are typically water-resistant to at least 200 meters. They often feature a unidirectional rotating bezel, which allows divers to track elapsed time underwater safely. In addition to their durability, diver's watches usually have luminous hands and markers for visibility in low-light conditions. Many models also include features like helium escape valves for saturation diving and robust materials like stainless steel or ceramic to resist corrosion from saltwater.