Calibration Gas, CGA Number Not Applicable, Container Type Cylinder, Cylinder Capacity 34 L, Cylinder Diameter 3.13 in, Cylinder Height 10.6 in, For Use With Mfr. No. TX-12-HS, Mfr. No. TX-6-HS, Gas Mixture Hydrogen Sulfide 25 ppm, Gas Type Hydrogen Sulfide, Operating Temperature – Maximum 125 Degrees F, Product Type Calibration Gas, Chemical Formula H2S, Operating Temperature – Minimum 0 Degrees F, Accuracy +/-2 Percent, Background Gas Air