Combustible Gas Detector, Calibration Certificate Type Not Certified, Features One Hand Operation with Thumb Controlled Sensitivity Adjustments, Gases Detected Acetone, Alcohol, Ammonia, Butane, Ethane, Gasoline, Hydrogen Sulfide, Industrial Solvents, Jet Fuel, Methane, Naphtha, Paint Thinners, Propane, Smoke, Carbon Monoxide, Includes (3) Batteries, Instructions, Maximum Operating Temperature 122 Degrees F, Minimum Operating Temperature 32 Degrees F, PPM Detection Range 10 ppm (Methane)