Combustible Gas Detectors, 50 ppm, Display & Sound AlertFollowing is a partial list of the more common gases detected: natural gas; propane; butane; methane; acetone; alcohol; ammonia; steam; carbon monoxide; gasoline; jet fuel; hydrogen sulfide; smoke; industrial solvents; lacquer thinner; naphtha Audible and visible alarms Low power semi conductor sensor Includes: Soft carrying case and batteries; Sensitivity: 50 ppm methane Warm up Time: Approx. 5 minutes Response Time: < 2 seconds Alarm Limit: At 10%