Conductivity is the measure of a material's ability to carry electric current. Siemens "g" is the base unit of conductance and is the reciprocal of resistance and measured in ohms. The solution conductivity measurement indicates the degree of electrical conductivity in the defined amount of solution. The electrical conductivity of solution is similar to the number of ions available in it, and so measuring the conductivity of a solution will give a reading of the solution.

The principle by which the system measures conductivity is simple. There are two conductivity plates placed on the sample and potentially (usually an alternating voltage) are applied and the current is then measured. By the voltage and current values, the conductivity can be determined. A constant specific conductivity can be determined by multiplying the conductivity by the electrode cell.

This constant is calculated with the following formula,

Gt = Gt is needed { 1 + a (t - t is needed) }

Where Gt is the conductivity at any temperature in °C

G tcal is the conductivity at the calibration temperature in °C

a is the temperature coefficient of the solution

t the calibration temperature is required.

By taking into account the temperature coefficient of the sample with the modern conductivity meter, this change can be compensated automatically or manually. For accurate behavioral measurement, automatic temperature compensation (ATC) with a different temperature sensor is required and the standard and sample must be measured at the same temperature. Conductivity is also used to determine total dissolved solids (TDS) and salinity.