{HEAD ~ The digital processor} is adapted to modify the potential to maintain the current inside a predetermined range such that {TAIL ~ the potential} is representative of the solution pH when the current is inside the predetermined range 
{ HEAD ~ The digital processor } is adapted to modify the potential to maintain the current inside a predetermined range such that { TAIL ~ the potential } is representative of the solution pH when the current is inside the predetermined range
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH