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High-Accuracy Fluorescent Do Sensor for Wastewater and Aquaculture. Fluorescence Quenching Technology: Fast response, low drift, no polarization, unaffected by flow rate or dirt. Corrosion Resistant Shell: Made of 316 stainless steel, suitable for harsh environments. IP68 Protection Level: Fully protected against dust and water immersion for various conditions. RS485 Communication Interface: Supports standard Modbus-RTU protocol with strong anti-interference. Simple Calibration Process: Supports air calibration without need for zero point calibration. Customizable Cable Length: Standard 3m cable with customizable options available upon request. 24/7 Technical Support: Engineers available via email, phone, or online platform.