Handheld 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 LCDIncludes Batteries