... complete imported machinery cores, boasts the advantages of accuracy measurement, high endurance and speed. automobile exhaust gas analyzerSV-4Q automobile exhaust ... , via micro-computer analysis, directly measure the thickness of HC, CO and CO2 in the exhaust gas of vehicles and ... (relative error,0-10%) CO2:±5% (relative error,0-20%)HC:±5%(relative error ,0-4000ppm)±10% (relative error,4001-10000ppm ...