The Combined Puc Machine is used for the testing and setting of all carburettors (petrol - leaded or unleaded) and petrol injection systems on any vehicle. It is a meter used to monitor the exhaust gas temperature of an internal combustion engine in conjunction with a thermocouple -type pyrometer. Combined Puc Machine is a device used to measure exhaust gases caused by combustion. Also known as an emission gas analyzer, it effectively measures different gases present and gives readings about their content.