AQM-399 Carbon Dioxide CO2 Monitor Indoor Air Quality Meter Temperature Humidity Tester Face Icon Colored Display with Alarm 400~5000PPM NDIR Sensor

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This air quality monitor is designed to measure and display key environmental parameters such as Carbon Dioxide (CO2) levels, temperature, and humidity in real time. A useful device for various applications, including ensuring the quality of indoor air in homes, offices, schools, and other environments to ensure that indoor air quality is within acceptable and healthy ranges.
A user-friendly design with the inclusion of a face icon for visual interpretation simplifies the data presentation. This feature can help users quickly understand the air quality status without checking into the numerical values.


  • Large LED screen display
  • Testing parameters: Carbon Dioxide (CO2), Temperature, and Humidity
  • Large 800mAh capacity lithium battery with 5V micro USB charging
  • Low battery indicator
  • Simple calibration procedure
  • Alarm function


  • Display method: Large LED Screen
  • Working Atmospheric Pressure: 86Kpa~106Kpa
  • CO2 Measurement
    • Range: 400~5000PPM
    • Resolution: 1PPM
    • Sensor: Infrared (NDIR)
  • Temperature Measurement:
    • Range: -10~50°C (14~122°F)
    • Accuracy: ±1°C(±1.8°F)
  • Relative Humidity Measurement:
    • Range: 20%~85%
    • Accuracy: ±4% RH
  • Sampling time: 1.5 seconds
  • Storage temperature: -10~60°C (14~140°F)
  • Concentration unit for CO2: PPM
  • Power source: Lithium battery with 800mAh capacity; 5V DC power charging via micro USB port
  • Weight: approx. 150gms
  • Dimension: 96 x 33mm

Set Includes:

  • 1 x Air Quality Monitor
  • 1 x Micro USB Charging Cable
  • English Instruction Manual
  • Standard Factory Packaging

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