The sensing element or {HEAD ~ sensor} can be calibrated for a specific user or a group of {TAIL ~ users} 
The sensing element or { HEAD ~ sensor } can be calibrated for a specific user or a group of { TAIL ~ users }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL