Indoor Air Quality Meter, Desktop/Wall Mount


Real-time data logger measures carbon dioxide (CO2), temperature and humidity on a high-resolution 7″ color TFT LCD touchscreen display.


This indoor air quality meter measures and records carbon dioxide (CO2), temperature, and humidity. The R9920 features a high-resolution color TFT touchscreen display, user-selectable recording times, programmable alarm set points, a built-in desk stand, and a wall mounting bracket. Quickly generate an Excel file with raw data and export recorded data to a computer without the use of the software.


  • Simultaneously monitors carbon dioxide (CO2), temperature and relative humidity
  • Low-drift NDIR CO2 sensor for stable and accurate readings
  • User selectable unit of measure (°C or °F)
  • 7" (178mm) high-resolution color TFT LCD (1024 x 600 pixels)
  • User adjustable high and low alarms
  • Max/min display
  • Internal 16GB memory stores data points in CSV format
  • User selectable sampling rate from 1 second to 24 hours
  • Internal time and date stamp
  • Rechargeable li-ion battery
  • Built-in desk stand and wall mounting bracket
  • Low battery indicator

What's included with the REED R9920

  • Indoor Air Quality Meter
  • USB Cable
  • Power Adapter
  • Wall Mounting Bracket
Measuring Range32 to 122°F (0 to 50°C)
Accuracy±1.8°F (1°C)
Measuring Range0 to 100% RH
Accuracy±3.5% (20 to 80% RH)
±5% (<20% and >80% RH)
Resolution0.1% RH
CO2 (Carbon Dioxide)
Sensor TypeNondispersive Infrared (NDIR)
Measuring Range0 to 9999ppm
Accuracy±5% rdg +75ppm
Response Time<2 seconds
General Specifications
Display7" (178mm) high-resolution color TFT
Display Resolution1024 x 600 pixels
Adjustable BrightnessYes
Data Logging CapabilitiesYes
Real-Time Clock and Date StampYes
Selectable Sampling RateYes (between 1 second and 24 hours)
Internal MemoryYes (16GB)
AlarmsYes (Low and High)
Kick StandYes
Wall MountableYes (bracket included)
Low Battery IndicatorYes
Power Supply3000mAh rechargeable Li-ion battery/power adapter
Battery Life~2 hours
Charge Time~9 hours
PC ConnectivityUSB Cable (Type-C)
USB Cable Length10' (3m)
Product CertificationsCE
Operating Temperature14 to 104°F (10 to 40°C)
Storage Temperature14 to 104°F (10 to 40°C)
Operating Humidity Range0 to 100%
Maximum Operating Altitude6561' (2000m)
Dimensions7.8 x 4.6 x 1" (198 x 118 x 25.7mm)
Weight12.9oz (365g)

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