A conductivity meter has a test probe. When the probe is placed in the liquid to be measured, the meter applies voltage between two electrodes of the probe. The electrical resistance of the solution causes a drop in voltage, which is read by the meter. The meter converts this reading into milli-micromhos or milli-microSiemens per centimeter.
The meter measures the electrical conductivity of ions in a solution in a solution. It simply applies an electric field between two electrodes and measures the electrical resistance of the solution. To avoid changes in the substances, a layer effect on the electrodes, an alternating current is applied. Today there are a variety of models of conductivity meters. Some of them include TDS (total dissolved solids) measurements.