A Digital Conductivity meter is a precise and rugged instrument designed for the most accurate measurement of conductance. Generally, the measurement of conductance is not any harder than measuring resistance in fact conductance is the inverse of resistance. However, most ohm meters operate from direct
voltage and current if used in a liquid it would invariably give raise some sort of electrolysis that would distort the measurement.
To counter the electrolysis the meter must operate with an AC voltage or current of sufficiently high frequency. A probe for measuring in liquid is made readily from a print header. Two headers (preferably gold plated) from an excellent probe with a fixed distance between the electrodes. The link between the electrodes and connecting wires should be made waterproof. This probe is called a cell. This instrument is calibrated for cell constant one.
Conductance S = Siemens = 1/2 international unit of conductance.
The applications of conductivity meters in textile manufacturing, water works department, laboratories, and educational institutions.