REED R9905 Data Logging Indoor Air Quality Meter


Measures carbon dioxide (CO2), temperature, humidity and automatically calculates time-weighted average (TWA) and short-term exposure Limit (STEL).

REED R9905 Specifications


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)

Alarms 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 / 11

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)

What's included with the REED R9905

  • Indoor Air Quality Meter
  • USB Cable
  • Hard Carrying Case
  • Batteries

Ideal Applications for the REED R9905

  • Environmental monitoring in buildings, schools, hospitals and factories
  • Verify HVAC/R system installation and system performance
  • Manufacturing processes where high CO2 concentrations must be measured, such as fire extinguishers, wine, soda and sugar industries