In another embodiment, an additional sensor can measure another piece of information regarding {HEAD ~ the person} using {TAIL ~ the hydration sensor}, such as the persons body temperature or activity level 
using
In another embodiment , an additional sensor can measure another piece of information regarding { HEAD ~ the person } using { TAIL ~ the hydration sensor } , such as the persons body temperature or activity level
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH