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