... HC, CO, CO2, O2 contained in exhaust gases from gasoline engine Ten Years Professional Auto Diagnostic Tools Exporter, we are sure to ... 1. Measure concentration of HC, CO, CO2, O2 contained in exhaust gases from gasoline engine of vehicles. Advanced NDIR (non-Dispersive ... ) × 450mm(D) MST-406EN Automotive Emission Analyzer(4-Gas/Portable) auto exhaust gas analyzer