I tested this device by capturing CO from car exhaust in a zip tie and then slipping a professionally calibrated CO meter and this detector into my pocket. First, the detector didn't record carbon monoxide levels very accurately. Then the alarm never went off or the LED didn't even blink and the CO concentration was over 400 ppm after 20 minutes. I'm glad I tested this device before trusting it with my life. I'm returning it and going to another brand.
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