E6000-5SC Hand–Held Industrial Emissions Analyzer. O2 (0-25%), CO (0-8000ppm), NO/NOx (0-5000ppm), SO2 (0-5000ppm), and CxHy/HC (0-5%) Gas Sensors. The E6000-5SC 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.