... MAIN SPECIFICATIONSFG-410(2G): HC, CO, oil temp (optional), engine rotating speed (optional).FG-410(3G): HC, CO, CO2, ... oil temp (optional), engine rotating speed (optional).FG-410(4G): HC, CO, CO2, ... CO, CO2, O2, NO, y , oil temp (optional), engine rotating speed (optional).Measuring ranges: HC:0~10000ppm CO:0 ... { 12ppm vol (absolute error) or { 5% (relative error) Gas analyzer