Conductivity sensors are not a single brand but a category of industrial sensors used to measure the electrical conductivity of liquids, essential for applications in water quality monitoring, chemical processing, and pharmaceuticals. Major brands in this sector include METTLER TOLEDO (Switzerland/USA), Emerson (USA), and Endress+Hauser (Switzerland/Germany). These companies offer high-precision sensors for industries like wastewater treatment, food & beverage, and life sciences. Key products include inline conductivity probes, toroidal sensors, and benchtop meters, designed for accuracy and durability in harsh environments.