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