Calibration Gas, Container Type Cylinder, Cylinder Capacity 29 L, Cylinder Diameter 2.88 in, Cylinder Height 11.5 in, For Use With Multi-Gas Monitors, Gas Mixture Nitrogen Dioxide 25 ppm, Gas Type Nitrogen Dioxide, Product Type Calibration Gas, Accuracy +/-5 Percent, Background Gas Nitrogen, Calibration Certificate NIST, Cylinder Material Aluminum, Outlet Connection Type C-10, Operating Pressure – Maximum 500 psi