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