... exhaust gas analyzer used to measure the concentration of HC,CO,CO2,O2 SV-4Q automobile exhaust gas analyzer ... via micro-computer analysis, directly measure the thickness of HC, CO and CO2 in the exhaust gas of vehicles ... :0~10.0 10-2(%)CO2:0~20.0 10-2(%)HC:0~10000 10-6(ppm)O2:0~25 ... (relative error,0-10%) CO2:±5% (relative error,0-20%)HC:±5%(relative error ,0-4000ppm)±10% (relative error,4001-10000ppm ...