Industrial Scientific M40 Gas Monitor

Industrial Scientific M40 PN: 
18105437-01111

Industrial Scientific M40 Calibration Gas PN:
1810-3937

Industrial Scientific M40 Calibration Gas:
25ppm Hydrogen Sulfide
100ppm Carbon Monoxide
25% LEL Pentane (or 50% LEL Methane)
19.0% Oxygen
Nitrogen Balance