Drager 58L CH4 2.5%/ calibration gas is a must-have for accurate gas detector testing. This blend contains 2.5% CH4, 15ppm H2S, 50ppm CO, and 18% O2, with N2 as the balance. The sturdy aluminium cylinder holds 58 litters at 500 psig pressure. Moreover, it boasts a long 24-month shelf life, ensuring reliability for regular maintenance. The cylinder uses a 5/8”-18 UNF thread, making it easy to connect to various regulators. Overall, this calibration gas helps keep your gas monitors working correctly and safely.