ZZW Portable COD Tester Technicle Parameters ItemParametersTesting ParametersHigh CODMedium CODLow CODTest Range(mg/L)300-3000200-100050-500Detection Limit(mg/L)2005020Reaction Time10min(High, Medium), 40min(Low)Salt ResistanceCL-≤15,000mg/LDisplay Interface128x64 dot matrix structure, LCD display, English menu-select Power Supply4 PCS of Alkaline AAA battery, which can work for over ten hours& ...