Photo 1 of Air Quality Monitor High Sensitivity CO2 Monitor Formaldehyde Detector TVOC/Temp./Humidity Air Quality Monitor Indoor with Buzzer Prompt,Max Value Highlight & 120s Countdown,Vent Design,Backlit Screen

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Photo 1 of Air Quality Monitor High Sensitivity CO2 Monitor Formaldehyde Detector TVOC/Temp./Humidity Air Quality Monitor Indoor with Buzzer Prompt,Max Value Highlight & 120s Countdown,Vent Design,Backlit Screen Photo 2 of Air Quality Monitor High Sensitivity CO2 Monitor Formaldehyde Detector TVOC/Temp./Humidity Air Quality Monitor Indoor with Buzzer Prompt,Max Value Highlight & 120s Countdown,Vent Design,Backlit Screen