58L-421 – CALIBRATION GAS 58L Description Description Calibration Gas 58L Capacity Gas Mixture : Carbon Monoxide CO – 100ppm Hydrogen Sulfide H2S – 25ppm Methane CH4 – 2.5% Volume ( 50% LEL ) Oxygen O2 – 18% Volume Nitrogen N2 – Balance Related products TYGON TUBING DOCK2-2-00-N QT-XWHM-A-Y-NA Gas Alert Quattro 10L-490-T – 10LBUMP GAS