Many of the chemicals commonly used in the semiconductor industry are ionic, and, when mixed with de-ionized water, result in electrically conductive solutions.
When properly calibrated, a conductivity meter can provide reliable concentration measurements, even for dilute solutions.
The method is appropriate for binary mixtures, typically (though not necessarily) of a chemical dissolved in water.
The instrument is simple, cost-effective, and easy to use.
WetCon100: Advanced In-line Conductivity Meter