I am using this for a caravan as I didn't like the built in CO sensor that came with the trailer. Oxygen readings from him were consistently low (20.1% instead of 20.9%), sometimes causing false alarms. This may be because I use it at 6000+ feet. I found the article "Cali Gas" and was able to solve this problem. When I breathe hard directly on it, it works as it should! My only complaint is that I can't use it while charging. Therefore four instead of five stars.
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