California Proposition 65: This product contains a chemical known to the State of California to cause cancer. Calibration Gas, Container Type Cylinder, Cylinder Capacity 103 L, Cylinder Diameter 3.5 in, Cylinder Height 13.75 in, For Use With Mfr. No. 24-7059, Gas Mixture Carbon Monoxide 500 ppm, Gas Type Carbon Monoxide, Product Type Calibration Gas, Chemical Formula CO, CAS Number 630-08-0, Accuracy +/-2 Percent, Background Gas Air, Calibration Certificate NIST, Cylinder Material Steel, Outlet Connection Size 5/8 In. -18, Outlet Connection Type UNF, Operating Pressure - Maximum 1, 000 psi. This item has been restricted from sale in the following state (s): []