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