Conductivity meter: It is used to measure conductivity of a solution.
Two electrodes (platinum plates) are placed in a sample, a potential is applied across the electrodes, and the current is measured. The meter consist of a conductivity probe and an EC meter. The probe consists of two electrodes (platinum plates) set at a constant distance from each other. The probe is connected by a cable to the meter. The probe(two electrodes) is placed in the solution such that the solution covers the electrodes and an alternating voltage is applied by the meter to the electrodes. The meter measures the resulting current that flows between the electrodes and uses Ohm’s law to calculate first the conductance of the solution and then the conductivity of the solution using the conductance and cell constant.