Wristbands to record sleep’s quality, earplugs to measure body temperature, and vests for cardio-vascular monitoring. In a physician’s office, sometimes large, expensive instruments have these functions, but costumers are already able to buy smaller counterparts and use them every day: wearable devices that measure bodily functions and help their user to live a healthier life. Until now, they are mainly aimed at fitness enthusiasts and sportspeople. There are no purely medical uses yet. Learn in our current Topic of the Month how this could change.