The Series 1000 Oxygen Deficiency Monitor is an oxygen monitor designed to provide continuous protection from oxygen deficient atmospheres. The Series 1000 Oxygen Deficiency Monitor is a popular choice of government labs, universities, and industrial facilities to help ensure the quality of breathing air. The Series 1000 Oxygen Deficiency Monitor’s primary use is for applications when the possibility exists that breathing air oxygen could be displaced by stored or piped inert gases such as nitrogen, helium, argon, carbon dioxide, etc. resulting in a hazardous condition.