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Fison Dissolved Oxygen Meter measures dissolved oxygen from 0.00 to 20.00 mg/L for water quality assessment, environmental monitoring, and laboratory testing. Its automatic salinity compensation, barometric pressure correction, Auto-Read endpoint detection, and calibration reminder improve measurement accuracy while reducing manual adjustments. Manufactured for laboratories, environmental monitoring facilities, aquaculture units, and wastewater treatment plants, it supports USB connectivity, 500-record data storage, and CE certification.