Automobile Exhaust Gas Analyzer Used to measure the concentration of HC,CO,CO2,O2,NOx SV-5Q automobile exhaust gas analyzerFunctional feature:In accordance ... the petrol high-voltage flexible cord, measuring petrol rotate speed.4.Preheat time: 10mins5.Resolution: CO: 0.01%vol HC ... After preheating, zero excursion and measurement distance excursion in 4 hours should not be over the allowance value of ...