Combustible Gas Detector, Calibration Certificate Type Not Certified, Features Automatic Calibration and Zeroing, Gases Detected Acetylene, Butane, Isobutane, Propane, Includes Soft Carrying Case, Maximum Operating Temperature 110 Degrees F, Minimum Operating Temperature 32 Degrees F, PPM Accuracy 2 ppm (Propane), 5 ppm (Methane), PPM Detection Range 2 ppm (Propane), 5 ppm (Gasoline), Probe Length 17 in, Manufacturer Warranty Length 1 yr (Sensor), 2 yr, Battery Chemistry Alkaline