The Headspace portable gas analyzer is specifically designed to test for the presence of oxygen and carbon dioxide in food, packaged under modified and controlled atmospheres. The analyzer uses long life electrochemical fuel cell for oxygen analysis and an infra red sensor for carbon dioxide analysis. Testing is done by simply inserting the needle probe into the package for test and pressing a PUMP ONOFF key on the front panel to start the internal sample pump. The analysis of the gas is then shown on the touch screen display.