Conductivity is measured in micro siemens or micro mhos and is an indicator of the number of ions present in solution and is a measurement of their build up in water and liquid systems. Rinse water, DI water, cooling towers, horticulture, wash water systems, swimming pools, aquaculture, drinking water, food-process and facility water are common applications of conductiveity. Conductivity is very easily affected by temperature and all feature testers automatically compensate for it.