{TAIL ~ A method} and apparatus for monitoring a liquid undergoing anaerobic fermentation in {HEAD ~ a vessel} is disclosed 
{ TAIL ~ A method } and apparatus for monitoring a liquid undergoing anaerobic fermentation in { HEAD ~ a vessel } is disclosed
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH