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