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I understand black damp and unsafe oxygen is a real issue not to be ignored when working underground; especially when there is a lot of old rotting timbers. According to my research rotting timbers produce carbon dioxide. Please correct me if I'm wrong as this is a sensitive/life saving issue. When finding/choosing a confined space personal gas detector there is endless options. I have found interest in the msa altair single gas detector, but they do not have a CO2 model. I have found that there is not very many options in looking for a personal CO2 detector. I understand that there is many detectors that snuff for multiple gases but even so most of them do not test for CO2. Then there is the idea of using an O2 detector, but to my understanding is: there can be toxic levels of CO2 even with oxygen levels at 19.5% or more; thus making an O2 detector inappropriate. I am really trying to find a personal confined space gas detector that detects toxic CO2 levels, but not necessarily limited to. I have a current budget limit of around $500. Please inform me of your own experiences with this subject and hopefully any recommendations you guys can make. Like I said this subject is not to be taken lightly and is a matter of life and death. I am really looking for some advice from the veterans on this one. We are not using any explosives in the mine so our biggest concerns is existing gases in the mine.