Gas Detector Sensor Gas Detected Carbon Monoxide Hydrogen Sulfide Measurement Range 0 to 1 ppm Carbon Monoxide (500 ppm) Compatible Detector Model/Series MultiRAE ToxiRAE Pro Sensor Type Electrochemical Compatible Detector Manufacturer Part Number AreaRAE Pro/Plus MultiRAE Sensor Life 1 yr Series MultiRAE ToxiRAE Pro Sub-Brand RAE Resolution Carbon Monoxide 1 ppm Hydrogen Sulfide 0.5 ppm Operating Temperature - Maximum 122 Degrees F Operating Temperature - Minimum -4 Degrees F