The model ISC40 sensors are designed for use with our 2-wire analyzers and 4-wire analyzers. This combination exceeds all expectations for conductivity measurement in terms of reliability, accuracy, rangeability and price performance. The accuracy is 0.5% of reading plus 0.5 uS/cm for any conductivity value – regardless if it is measured in rinse water or concentrated acids. These sensors are guaranteed to have a long life, even under harsh industrial conditions.