1) Introduction: Gasboardâ??5020 can be used for measurement of the concentration of automobile emission gas CO ,CO2 ,HC ,O2 and NO (optional), based on NDIR technology. This analyzer is designed with portable and smaller physical dimensions. The general application is for automobile emission check station or car repair garage. 3) Features: .Proprietary Infrared(NDIR) gas sensor .Can measure gas concentration of CO ,HC ,CO2 ,O2 ,NO (optional) simultaneously .With 320*240 LCD real time display .Air/fuel ratio calculation and display automatically. .Auto-zero calibration with air .Oil temperature and RPM interface. .Plug in Printer optional. .RS-232 interface and optional software.