As indicated above the prior art sought to control the charge per {HEAD ~ unit mass} of {TAIL ~ the toner} and thus the calibration of the printer using low field conductivity measurements of the toner 
of
As indicated above the prior art sought to control the charge per { HEAD ~ unit mass } of { TAIL ~ the toner } and thus the calibration of the printer using low field conductivity measurements of the toner
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH