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