“How low or to what parts per million CO will this detector read down to? Is this considered a low level CO alarm?”
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Nest Protect Peak CO levels, during CO alarms, range from 70 parts per million (ppm) to 1,964 ppm, with a median of 142 ppm based on field studies. After a CO event, Nest Protect will tell you the highest level of CO that it detected. You can find the peak CO level in Protect History. Nest Protect is not a low-level carbon monoxide monitor and will alert you to carbon monoxide only in a Heads Up or Emergency Alarm event.
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