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REED R9905 Data Logging Indoor Air Quality Meter

Measuring Range -4 to 140°F (-20 to 60°C)
Accuracy ±1.5°F (±0.8°C)
Resolution 0.1°F/°C
Measuring Range 0 to 100% RH
Accuracy 10 to 90% RH: ±3%
<10% & >90% RH: ±5%
Resolution 0.1% RH
CO2 (Carbon Dioxide)
Sensor Type Nondispersive Infrared (NDIR)
Measuring Range 0 to 30,000ppm
Accuracy 0 to 5000ppm: ±(75ppm +3% rdg.)
5001 to 30,000ppm: ±(150ppm +5% rdg.)
Resolution 1ppm
Warm-up Time 20s
Sampling Rate 2s
General Specifications
Display LCD
Backlit Display Yes
Data Hold Yes
Min, Max, Avg Functions Yes
CO2 Short Term Exposure Limit (STEL) Yes (15 mins)
CO2 Time Weighted Average (TWA) Yes (8 hours)
Datalogging Capabilities Yes
Real-Time Clock and Date Stamp Yes
Selectable Sampling Rate Yes (between 1s and 60m59s)
Internal Memory Yes (32,000 datapoints)
Alarm Yes (Low and High)
Auto Shut-off Yes (adjustable)
Kick Stand Yes
Low Battery Indicator Yes
Power Supply 9V battery
Battery Life Approx. 10 hours (continuous use)
PC Connectivity USB
Software OS Compatibility Windows 7 / 8 / 10
Product Certifications CE
Operating Temperature 32 to 122°F (0 to 50°C)
Storage Temperature -4 to 140°F (-20 to 60°C)
Operating Humidity Range 0 to 90%
Storage Humidity Range 10 to 75%
Maximum Operating Altitude 6561′ (2000m)
Dimensions 11.2 x 2.6 x 1.5″ (284 x 65 x 39mm)
Weight 10.7oz (304g)


REED R9905 Offers

This data logging Indoor Air Quality (IAQ) Meter has the ability to record samples on internal memory and keep track of registered readings with a time and date stamp. The R9905 features a Nondispersive Infrared (NDIR) CO2 sensor for stable, accurate readings and the option to track live measurements via software.


  • Triple LCD display simultaneously monitors carbon dioxide (CO2), temperature and relative humidity
  • Calculates time-weighted average (TWA) and short-term exposure limit (STEL)
  • Low-drift NDIR CO2 sensor for stable and accurate readings
  • Temperature and relative humidity measurements help determine thermal comfort
  • Easy-to-read backlit LCD display
  • User adjustable audible alarm
  • Data hold, Max/Min and Average functions
  • Record up to 32,000 datapoints and keep track with internal time and date stamp
  • User selectable sampling rate from 1 to 60 mins
  • Low battery indicator and auto shut-off
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