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6-in-1 Air Quality Monitor for PM2.5/PM10/HCHO/TVOC/CO/CO2, Portable Multifunctional Detector with LCD Screen - Home, Of 6-In-1 Detection: Monitor PM2.5, PM10, HCHO, TVOC, CO, and CO2 simultaneously with one device – no need for multiple detHZREAUQUE 
Smart Sensor AS8700A Handheld Carbon Monoxide Meter High Precision Digital CO Leak Detector Analyzer Range 1000ppm Function: SMART SENSOR Carbon monoxide gas detector is a portable detector for detecting carbon monoxide (CO). Can measuFirst Alert 
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