Product Description Item Number | 18109155Industrial Scientific 58 Liter Cylinder Mixed Calibration & Bump Test Gas, with iCard to connect to DSX Docking Stations (25 ppm H2S, 100 ppm Co, 25% LEL Pentane, 18% O2) Recommended for the Ventis MX4 equipped with LEL(Pentane), O2, CO & H2S Sensors. This mixture of gas is the default concentration that a standard 4-Gas Ventis MX4 or MX6 iBrid gas monitor is programmed for. For best results, use only Industrial Scientific calibration equipment for regular instrument calibration and maintenance. 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.This Industrial Scientific 58 liter Combination Calibration/Bump Gas can be used for the following Industrial Scientific V-Cal, DS2 & DSX Series Docking Stations for Bump Testing and Calibrating the following monitors: Ventis MX4, iQuad MX4, M40, MX6, iTX. These monitors must be equipped with the following four sensors: LEL (Pentane), O2, CO, H2S.If you have any questions regarding your calibration gas or just want to make sure you are selecting the correct combination please contact customer service @ 800-949-7233 or email firstname.lastname@example.org.