This cylinder contains a mixture of gases that will
calibrate multiple sensors at the same time from a single
calibration event. It is for use with gas detectors that have
sensors for the following calibration gases:2.5% CH4
(methane), 18.0% O2 (oxygen), 25ppm H2S (hydrogen
sulfide),100ppm CO (carbon monoxide). This calibration
gas cylinder requires the REG-DF-1 or the REG-0.5
Calibration Gas Regulator.