[SirBrass]

It means it measures both the electrical resistance (impedance is the technical term since resistance is technically only referring to the real component of impedance, when in real life there's both a real and imaginary part, b/c even in a normal wire there's going to be inductive and/or capacitive elements to it, not just pure resistivity) and temperature of the sensor wire that is used to determine the E-content of the fuel in order to make its determination.