KNF-500PRO Online Multi-Parameter Water Quality Sensor The Kainafu KNF-500PRO online multi-parameter sensor adopts a multi-in-one modular structure . Each single-parameter sensor is an independent RS485 digital probe that seals water-tightly onto the main body. Calibration data is stored inside each probe, allowing simple on-site calibration or replacement. It measures water temperature, pH, ORP, dissolved oxygen, turbidity, chlorophyll, cyanobacteria, conductivity (salinity)