Combustible Gas Detector, Calibration Certificate Type Not Certified, Features Adjustable Sensitivity, Gases Detected Ammonia, Ethanol, Hydrogen Sulfide, Propane, Includes Hard Carrying Case, Maximum Operating Temperature 122 Degrees F, Minimum Operating Temperature -20 Degrees F, PPM Accuracy 1 ppm (Gasoline), 5 ppm (Methane), PPM Detection Range 1 ppm (Gasoline), 5 ppm (Gasoline), Probe Length 15 in, Overall Height 26 in, Manufacturer Warranty Length 3 yr, Battery Voltage 1.5V