The ZW-DO-PR is a high-precision dissolved oxygen (DO) sensor designed for industrial water quality monitoring. Utilizing the reliable fluorescence method, it delivers accurate measurements from 0 to 20.00 mg/L (0–200% saturation at 25°C) with ±2% accuracy and automatic temperature compensation (Pt1000). Featuring RS485 (Modbus RTU) output, this submersible sensor is built with durable POM, ABS, PC alloy, and 316L stainless steel, ensuring IP68 protection for reliable operation in harsh environments. With a response time of <30s, two-point calibration, and a 1-year lifespan, it is ideal for applications such as aquaculture, wastewater treatment, and environmental monitoring.