What am i doing wrong? it counts down from 120 to 0 then changes modes and sits there. broken? i tried new batteries

Portable CO Detector (Carbon Monoxide Detector), Alarm Temp/Humidity Detector with Magnetic Back, Built-in 1000mAh Battery for Home/Travel/Outdoor

SKU: GW40.0008

Answer Question

After the initial countdown it immediately starts measuring CO in parts per million. Mine is very accurate. If yours remains on zero than no CO is detected. If it's doing something weird than maybe it doesn't work. It will not measure CO below 5 ppm eventhough the directs says it will.

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Portable CO Detector (Carbon Monoxide Detector), Alarm Temp/Humidity Detector with Magnetic Back, Built-in 1000mAh Battery for Home/Travel/Outdoor