CUPERTINO, California—Apple is trying to turn its smartwatch from a niche gadget into a lifeline to better health by slowly evolving it into a medical device.
In its fourth incarnation, called Series 4 and due out later this month, the Apple Watch will add features that allow it to take high-quality heart readings and detect falls. It’s part of Apple’s long-in-the-making strategy to give people a distinct reason to buy a wrist gadget that largely does things smartphones already do.
