This RS485 water quality potassium ion sensor is designed specifically for online monitoring, using an industrial grade durable housing and a high-sensitivity potassium ion selective electrode for stable and reliable measurement. Supports Modbus RTU protocol and can be directly connected to water quality monitoring systems to achieve remote data collection. Equipped with automatic temperature compensation function, effectively reducing environmental interference; IP68 protection level, capable of long-term immersion work, suitable for complex scenarios such as surface water, groundwater, aquaculture drainage, and industrial wastewater. Low power design, wide power supply range, flexible installation method. Assist users in real-time monitoring of changes in potassium ion concentration in water bodies, aiding in precise water quality management and process control.