This combustible gas leak detector with a measuring range of 50 parts per million. The sensitivity wheel is user-adjustable, and the alarm is at 10% LEL for methane. An earphone jack, soft carrying case, and three C-cell batteries are included. It detects methane, natural gas, benzene, ethane, propane, butane, acetone, alcohol, ammonia, gasoline, jet fuel, industrial solvents, lacquer, paint thinner, and naphtha. This item includes calibration certificate.