Providing protection from up to 5 potential atmospheric hazards including oxygen, combustibles and toxic gases, this portable gas detector is unmatched in its versatility.Product Overview : Providing protection from up to five potential atmospheric hazards including oxygen, combustible and toxic gases, GasAlertMicro 5 is unparalleled in its versatility, capability and overall value. BW Technologies by Honeywell's newest addition to its water-resistant line of portable gas detectors has transformed the market with its matchless array of features.