The resistor provides a difference in resistance between the conductive elements when contacted with a fluid comprising {HEAD ~ a chemical analyte} at {TAIL ~ a first concentration}, than when contacted with a fluid comprising the chemical analyte at a second different concentration 
The resistor provides a difference in resistance between the conductive elements when contacted with a fluid comprising { HEAD ~ a chemical analyte } at { TAIL ~ a first concentration } , than when contacted with a fluid comprising the chemical analyte at a second different concentration
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH