{TAIL ~ A hydration sensor} or sensing element configured to measure the hydration level of {HEAD ~ a user} is disclosed 
{ TAIL ~ A hydration sensor } or sensing element configured to measure the hydration level of { HEAD ~ a user } is disclosed
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH