The Portable Flue Gas Analyser model FGA 512 measures oxygen and carbon monoxide in the flue gas. It calculates carbon dioxide and combustion efficiency for a range of pre-selected fuels. It is suitable for analysing combustion efficiency of boilers. It is supplied with a sampling probe through which the flue is sampled into the analyser by suction from a built-in pump. Pre-programmed fuel such as Natural gas, Heavy oil. Memory storage upto 100 test results. Battery operated (DC 12V). Serial (RS232) output for printer or PC.