Dissolved Oxygen/Temperature Meter Feature: Measuring: Dissolved Oxygen/Temperature Automatic Temperature Compensation USB to PC Specification: Measuring scope (Dissolved Oxygen):0.0~20.0mg/Lorppm Resolution:0.01mg/L Precision:±0.1mg/L Calibration ±10℃:±0.3mg/L Saturation (Dissolved Oxygen):0.0~200.0% Precision:±3.00% Calibration ±10℃:±5.00% Measuring scope(Temperature):0.0~50.0℃ or 32~122 degree F Precision:±1℃ Compensation:0.0~40.0℃, auto More instrument choices please search Google for BKINSTRUMENT Offered by : Beijing Scientific Instruments & Materials Corp.