This device is your black box. It monitors who you talk to, how often, what you read, all your social media accounts, your guilty pleasures, your location, your physical activity, your calories, and now it could potentially measure your stress level, at least for Samsung users.
Samsung has updated its S Health app with a feature that allows users to monitor stress levels. How it works is that the user puts a finger to the screen. The heart rate monitor is then used to gather the data that determines the stress of the user. The app stores this data and maps it out over a period of time.
Stress causes health problems, but is little understood. One known symptom of certain types of stress is an increased heart rate, which would be caught by the monitor. Other types may go unnoticed. Also increases in heart rate are not always caused by stress. Exercise can all increase heart rate. A reading of stress could be attributed to a morning run. Caffeine, tobacco, or other legal stimulants may also increase heart rate, making a user potentially appear stressed. However, this information could also have its potential benefits.