Product Description Item Number 18109462Industrial Scientific 58 liter Combination Calibration Gas for the following Industrial Scientific Gas Monitors that are equipped with LEL, O2,H2S sensors; Ventis Pro & MX4 & MX6 iBrid.Each cylinder comes with its own smart card for connecting to the DSX or legacy DS2 Docking Stations with the iGas Regulators. Concentration: 25 ppm H2S, 18% O2, 2.5% LEL METHANEReplaces Part#18102241