User adjustable sensitivity wheel and earphone jack for loud environments. REED R9300 Offers This combustible gas leak detector is capable of detecting a number of gases including: natural gas, methane, benzene, ethane, propane, butane, acetone, alcohol, ammonia, gasoline, jet fuel, industrial solvents, lacquer, paint thinner and naptha. The R9300 is alarm is set at 10% (LEL) for methane. Features Detects a wide range of combustible gases including: gasoline, propane, natural gas and fuel oil High sensitivity detects small leaks Designed for one-handed operation 16" (406mm) gooseneck for hard to reach areas User adjustable sensitivity wheel Alarm set at 10% LEL for methane Earphone jack for loud environments (earphones sold separately) Tricolor visual indicator Audible (variable tick rate) and visual (LED) alarm indicators User replaceable sensor Included Combustible Gas Leak Detector Batteries Soft Carrying Case