Combustible Gas Detector Detects Acetone Acetylene Butane Ethane Gasoline Isobutene Methanol Natural Gas Propane Measuring Range Greater Than 5 ppm (Methane) Accuracy 5 ppm Methane Alarm Indicator Features Automatic Calibration Resets to Ambient Stable Sensor MSHA Certified Battery (4) AA Height 16 1/2 in Width 4 in Depth 3 in Includes Carrying Case Manufacturers Warranty Length 2 yr