E6000-5DC Measure Oxygen (O2), Carbon Monoxide (CO), Nitric Oxide (NO), Nitrogen Oxides (NOx), Nitrogen Dioxide (NO2), CxH/HC and Calculates Carbon Dioxide (CO2). The E6000-5DC Five Gas Industrial Portable Combustion Gas & Emissions Analyzer is a commercial and industrial gas analyzer that is a valuable tool designed for emissions monitoring and maintenance and tuning of combustion processes including boilers, burners, gas and diesel engines, turbines, furnaces, kilns, heaters, and laboratory analysis.