The IQ-350 Eagle is a portable instrument which comes equipped with an Infrared (IR) sensor for detection of Carbon Dioxide (CO 2 ), Carbon Monoxide (CO), or Hydrocarbons (HC’s). The unit can be optionally equipped with an additional sensor for the detection of Oxygen. The unit provides a digital display of gas concentration, built-in sample pump, and audible and visual alarms. It operates on 4 ‘C’ size alkaline or nicad batteries, or the AC adapter/charger. The Eagle comes standard with 3 ranges which are selectable via a switch on the front panel.