Handheld Indoor Air Quality Monitor Model 2211

The IAQ 2211 features quick start-up and high accuracy measurments of carbon dioxide and carbon monoxide concentration levels in the environment. Temperature and humidity are simultaneously measured with this instrument featuring a comfortable lightweight design.

  • Simultaneously measures and data logs multiple parameters such as: CO, CO2, Temperature, and Relative Humidity to monitor indoor air quality conditions.
  • Calculates Dew Point, Wet Bulb Temperature, Absolute Humidity, Humidity Ratio and % Outside Air.
  • Built-in memory allows user to store multiple point measurements. Equipped with RS232C terminal.
  • Easy user calibration with built-in calibration function.
  • Capable of continuously monitoring parameters via PC.
  • Large LCD shows multiple parameters at a glance.
  • Calculates dew point, wet bulb temperature, absolute humidity and humidity ratio.
  • IAQ Investigation
  • Ventilation Testing
  • Thermal Comfort Control
  • Monitoring Toxic Gas

CO Range 0 to 500PPM
Accuracy +/-3% of reading or +/-3PPM whichever is greater
Resolution 0.1PPM: 0-99PPM 1PPM: 100-500 PPM
CO2 Range 0 to 5000PPM
Accuracy +/-3% of reading or+/-50PPM whichever is greater
Resolution 1PPM
Temperature Range - 4 to 140F (-20 to 60C)
Accuracy +/- 1F (+/-0.5C)
Resolution 0.1F (0.1C )
Relative Humidity Range 2 to 98%RH
Accuracy 2 to 80%RH:±2%RH, 80 to 98%RH:±3%RH
Resolution 0.1%RH
Function Normal Mode Normal measuring (does not store and calculate the data.) Relative humidity, CO, CO2, Dew point, Wet bulb temperature, Absolute humidity and Humidity Ratio
Calculation Mode
Store the data, and calculate the maximum, minimum and average value.
% OA Mode Measure ventilation ratio (Ask for ventilation ratio by calculating from temperature and CO2 value)
Data Output Mode re-calculation of stored data and output of data to PC and Printer.
Calibration Mode calibration of CO and CO2.
Output Digital RS232C
Analog (options) DC 0 to 1V
Power Supply   AAA Battery x 4 (Mn, Alkaline, or Ni-Cd)
Dimensions Unit 3.5" x 7.5" x 2.0"
Probe Length: 12.5 inch / Diameter: 1.0 inch
Weight (including batteries) Approx. 1.2 lbs (500g)



Thermohygrometer Model 6841

For an ultra lightweight design and affordable price point, try the compact 6841 Thermohygrometer


  • Ultralight and palm-size
  • Easy to use  (Select temperature, humidity, or power on/off)
  • Indoor Environmental Measurement
  • Product Quality Control
 Measuring range Temperature -4 to 113ºF (-20 to 45ºC)
Humidity 5 to 95% RH
 Display resolution Temperature

0.1ºF or 0.1ºC

Accuracy Temperature

+/-0.9ºF (+/-0.5ºC)

Humidity +/-3%RH
Responsiveness 30 sec
Measuring Function conversion between ºF and ºC
Dimension Main Unit Approx. 2.4” x 4.7” x 1.3” (60 x 120 x 34mm)

Approx. φ19 x 170mm


Approx. φ3.3 x 1.5m

Power Supply AAA Battery x 4 (Mn, Alkaline, or Ni-Cd)
Operating Environment Main Unit

41 to 104ºF (5 to 40ºC)


-4 to 113ºF (-20 to 45ºC)

Storage Temperature

14 to 122ºF (-10 to 50ºC)

 Weight (including batteries) Approx. 6.3oz (180g)
 Accessories Operation Manual, AA batteries
Ordering Information Price $US 
Order Online 
IAQ 2211 includes probem meter, case, stand, software and NIST traceable calibration certificate $1880.00  
Carrying Case $115.00  
Probe Stand $37.00  
Analog Output $265.00  
PC communication cable $100.00  
AC Adapter $55.00  
Thermohygrometer 6841 with carrying case $250.00

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