With line of smart probes, Model 2100 can measure conductivity of liquids from 10-3 S/cm, such as low concentration of salt solutions in water, down to 10-15 S/cm, approaching hexane and other highly non-polar solvents. Factory-calibrated probes are completely sample-independent; there is no need to recalibrate probe every time sample with different conductivity or dielectric constant is measured. Probes can be disassembled for cleaning and reassembled in seconds with no change in cell constant.