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$69.93CO2 Carbon Dioxide Air Quality Monitor, Pollution & Ventilation Meter, Tester; Detect & Test Indoor Air Ventilation Levels with CO2 PPM Levels, Temperature and Humidity Sensor Readings on LED ScreenAmazon- $29.99Portable CO2 Detector, 3-in-1 Carbon Dioxide Detector Air Quality Monitor with Built-in Temperature Humidity Sensor, CO2 Level Monitor Alarm, CO2 Meter for Home, Office, TravelAmazon
- $35.99Siterlink Indoor CO2 Detector, Air Quality Monitor, Tester for Carbon Dioxide, Temperature and Relative Humidity, Indoor CO2 Monitor with Alarm, with Real-Time CO2 PPM Levels DisplayAmazon