When selecting medical watches, the most critical technical feature is the high-contrast dial with a visible second hand or digital pulse counter, essential for taking accurate vital signs. Materials must be hypoallergenic (316L surgical-grade stainless steel or medical-grade silicone) to prevent skin irritation during long shifts. Furthermore, ensure the watch has a water resistance rating of at least 3ATM or 5ATM, as frequent handwashing and exposure to fluids are inherent to clinical environments.