The significance of oxygen needs no definition. We all know the importance and have been learning and hearing about this since childhood. Hence we need to know the significance of oxygen concentration in the ambient air. The determination can be in terms of percentage of total volume or in terms of traces of the gas. We have a number of oxygen analyzers with variety in models and capacity depending upon the cell technologies. Oxygen analyzers are different for oxygen sensors, which can only provide current oxygen level readings. Oxygen analyzers do more than just reading the present level of oxygen in the ambient air. These devices have found its most important usage in the combustion chambers, coal mines and many other similar working spaces. In these places the level of oxygen is constantly changing.