Leak/Pressure Test Kit Detects Acetone Acetylene Alcohol Ammonia Butane Combustible Refrigerants Gasoline Hydrogen Sulfide Methane Naphtha Natural Gas Propane Smoke Solvents Steam Thinners Volatile Jet Fuel Accuracy 50 ppm Methane Audible Visual Indicator Features NIST Calibration Class 3 SELV Battery 9V Height 8 in Width 4 in Depth 18 in Calibration Certificate Included Yes NIST