REED Instruments R9300 Combustible Gas Leak Detector, Adjustable Sensitivity Detects a wide range of combustible gases including; natural gas, methane, benzene, ethane, propane, butane, acetone, alcohol, ammonia, gasoline, jet fuel, industrial solvents, lacquer, paint thinner and naptha Alarm set at 10% LEL for methane User adjustable sensitivity wheel Earphone jack for loud environments (earphones sold seperately) Includes batteries and carrying case