How to use an electrical conductivity meter?

An electrical conductivity meter is a device allowing the measure of the conductivity σ (expressed in S.m-1) or the resistivity ρ (expressed in Ω.m) of a solution.
In practice, the device measures a conductance G (expressed in Siemens Ω-1) or a resistance R (expressed in Ω) (R = 1/G).

The property of electrical conductance (or resistance) relates to the movement of ions (ion mobility ui).

Why measuring conductivity?

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