The Deep-Sea pH Sensor is a mass-produced sensor specifically designed for deep-sea environments. Based on the response principle of solid-state oxides to pH, it utilizes micro-scale solid-state oxide pH electrode fabrication technology and weak electrode potential signal detection and processing technology to achieve highly stable and sensitive pH measurements. The sensor supports long-term, unattended in-situ monitoring and can be integrated into fixed platforms such as shore-based stations, shipboard equipment or buoys