Calibration Gas, CGA Number CGA 600, Container Type Cylinder, Cylinder Capacity 58 L, Cylinder Diameter 3.5 in, Cylinder Height 14.25 in, For Use With GasAlert Series Sensors, Gas Mixture Hydrogen Sulfide 25 ppm, Gas Type Hydrogen Sulfide, Product Type Calibration Gas, Chemical Formula H2S, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate Included, Cylinder Material Aluminum, Outlet Connection Type C-10, Operating Pressure – Maximum 500 psi