Negative Positive
Title: not sensitive enough
Review: I have owned this unit for about 6 years. I thought my family was safe. Well our furnace had a CO leak. Level of CO detected up to 70 ppm. The detector never went off. It isn't sensitive enough. It will detect levels at 400 ppm in 4 to 15 minutes (it says this on the back). The furnace repairman said to get a detector that could detect levels of 70 to 100 ppm at the minimum. I am buying a new detector.
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