... and testing function.MAIN SPECIFICATIONSFG-410(2G): HC, CO, oil temp (optional), engine rotating speed (optional).FG-410(3G): HC, CO, CO2 ... (optional).FG-410(4G): HC, CO, CO2, O2, y , oil temp (optional), engine rotating speed (optional).FG-410(5G): HC, CO, CO2 ... , O2, NO, y , oil temp (optional), engine rotating speed (optional).Measuring ranges: HC:0~10000ppm CO ...