The sensing element can be coupled to {HEAD ~ a bottle} of {TAIL ~ fluid}, or a carrier with a timer 
of
The sensing element can be coupled to { HEAD ~ a bottle } of { TAIL ~ fluid } , or a carrier with a timer
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH