Dissolved Oxygen Meter pH Range - Dissolved Oxygen Range 0 to 50 mg/L Oxygen Concentration 0 to 500 Percent Waterproof Yes Automatic Temperature Compensation Yes Displayed Temperature Range -5 to 55 Degrees C Salinity Range - Free Chlorine - Total Chlorine - Turbidity Range - Operating Temp Range (C) -5 Degrees to 55 Degrees Resistivity Range - Ion Specific Electrode Range - Second Ion Specific Electrode Range - Specific Gravity - Display Graphic LCD