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