ACITEK LDO Model 1 is an optical luminescent dissolved oxygen probe optimized for seawater, municipal wastewater secondary treatment, nutrient monitoring and effluent discharge supervision. Different from traditional polarographic DO sensors, this LDO probe adopts luminescent oxygen quenching technology, featuring factory pre-calibration, no membrane replacement, no electrolyte refilling, zero measurement drift and strong anti-interference against sulfide, chloride and heavy metal ions. With compact Noryl & stainless steel structure, 0–20 mg/L measuring range and 3.5 bar pressure resistance, it delivers long-term stable online monitoring with minimal maintenance cost.