Industrial Scientific Calibration Gas, 58L- Carbon Monoxide 100 ppm, Hydrogen Sulfide 25 ppm, Pentane (LEL 25%), Oxygen 18%

All Industrial Scientific calibration cylinders are manufactured to the highest quality standards and include NIST traceable blend techniques, analytical leak testing of every cylinder, certified component concentrations and clearly marked lot numbers and expiration dates; Replacement cylinders are available in a variety of sizes and concentrations for all gases detected by Industrial Scientific instruments.