Dissolved Oxygen Meter, Dissolved Oxygen Range 0 to 20 ppm, Oxygen Concentration 0 to 200 Percent, Waterproof IP67, Automatic Temperature Compensation No, Displayed Temperature Range -6 Degrees to 46 Degrees C, 21.2 Degrees to 114.8 Degrees F, Salinity Range 0 to 40 ppt, Operating Temp. Range (F) 21.2 Degrees to 114.8 Degrees , Operating Temp. Range (C) -6 Degrees to 46 Degrees , Display Digital, Auto Power Off Yes, Memory 50 Data Sets, Temperature Compensation Range -6 Degrees to 46 Degrees C