105ES-MTH-100A: 100 PPM METHYL CHLORIDE BALANCE AIR (20.9% OXYGEN, BALANCE NITROGEN) CONTAINED IN A 105 LITER ALUMINUM CYLINDER WITH A C-10 CONNECTION contained in a 105 Liter Aluminum ecosmart Cylinder, For Use with Any and All Gas Detectors, Cylinder connection C-10, Calibration Certificate NIST, Made in the USA