Measuring range 0~20.00ppm 0~200.0% air saturation Output:4-20mA FeaturesInput from polarographic, galvanic ... 0~60,000ppmRelative Humidity0~100%TemperatureMeasuring and compensation range-2~52°CResolution+/-0.1°COutputAnalog output: ... 0~20 mA, 4~20mADigital output: Serial Interface RS-232, RFCalibration2 ... aquaculture dissolved oxygn controller/DO meter with 4-20mA/DO probe