X05NI77CP580001 | CARBON MONOXIDE (CO) 35 PPM HYDROGEN SULFIDE (H2S) 10 PPM METHANE (CH4) 2.5% VOL (50% LEL) OXYGEN (O2) 19.5% VOL NITROGEN (N2) BALANCE IN A 58 LITER CYLINDER WITH A C-10 CONNECTION Connection Steel Disposable Cylinder, For Use with Any and All Gas Detectors, Cylinder connection: C-10, Calibration Certificate NIST, Made in the USA, SDS# 012855