Gas Detector Sensor, Gas Detected Oxygen, Measurement Range 0 to 30 Percent, Compatible Detector Model/Series QRAE 3, Sensor Type Electrochemical, Compatible Detector Manufacturer Part Number QRAE 3, Sensor Life 2 yr, Series QRAE 3, Sub-Brand RAE, Resolution Oxygen 0.1 Percent, Operating Temperature - Maximum 122 Degrees F, Operating Temperature - Minimum -4 Degrees F, Chemical Formula O2