To date there are devices that measure steps or heart rate etc., But never a device that measures breathing.
Fair Las Vegas presented the "Spire Stone" stone necklace that shows the state of mind by examining how breathing. But this is not the only device that is introduced.
Among others is the scanner for
food or clothing robot that handles ..
Spire Stone finds if we are calm, focused or tense, and sends us messages to the smartphone being advised us to take a break. With phrases like "You do not make a deep breath in the last 20 minutes, you look tense moment", pendant sold for 150 dollars and promises to reduce stress by 50%.