7755 Digital CO2 Carbon Dioxide Temperature RH Humidity DP WB NDIR Sensor Indoor Air Quality 9999ppm USB Monitor Logger

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Poor indoor air quality is considered unhealthy because it causes tiredness, loss of ability to concentrate, and even illness (ex. Sick Building Syndrome). IAQ monitoring and survey, especially on CO2 level and air ventilation become widely applied in public areas such as offices, classrooms, factories, hospitals, and hotels.

This meter measures CO2 level, Air Temperature, Dew Point (DP), Wet Bulb Temperature (WB) and Humidity (RH) and is an ideal instrument for Indoor Air Quality (IAQ) diagnosis.

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  • Triple displays of CO2 level, temperature (°C/°F) and Humidity
  • Stable NDIR sensor for CO2 detection
  • Statistics of weighted averages
    • TWA (8 hours weighted average)
    • STEL (15 minutes-weighted average)
  • Backlight, Hold data, Min/Max
  • Sound warning alarm for CO2 high-level risk
  • Dual power source, battery (included) or 9V adaptor (**note: adaptor is not included in set). Power from battery is automatically cut off when 9V adaptor is in use
  • Easy manual calibration on CO2 and humidity
  • Portable Design
  • PC connection for on-line logging and data analysis (not included in set)
  • Portable Design
  • Manual calibration of CO2 and Humidity is available
  • Updates reading every second
  • Auto / Manual power off
  • Factory calibrated


  • Measuring Range:
    • CO2: 0~9999ppm
      • (2001~9999 out of scale)
    • Temperature: -10~60°C (14~140°F)
    • Humidity: 0.1% ~ 99.9%RH
    • Dew Point: -20.0~59.9°C
    • Wet Bulb: -5.0~59.9°C
  • Resolution: 1ppm, 0.1°C/°F, 0.1%RH
  • Accuracy:
    • CO2: ±50ppm ±5% of reading (0~2000ppm) other ranges are not specified
    • Temperature: ±0.6°C / ±0.9°F
    • Humidity : ±3%RH (at 25°C, 10~90% RH); ±5%RH (at 25°C, others)
  • Warm-up time: 30 seconds
  • Response time
    • CO2: <30 seconds (90% step change)
    • Temp: <2 mins (90% step change)
    • RH: <10 mins (90% step change)
  • LCD Size: 26mm x 44mm
  • Operating Condition: 0~50°C, 0~95%RH (avoid condensation)
  • Storage Condition: -20~50°C, 0~95%RH (avoid condensation)
  • Power Supply: 4x AA batteries
  • Battery life: >24 hours (alkaline batteries)
  • Meter size: 205mm x 70mm x 56mm ( L x W x H)
  • Dimension : 169mm(L) x 78.3mm(W) x 43.4mm(H)
  • Weight: 200g

Set Includes:

  • 1x Portable CO2 meter
  • 4x AA batteries
  • English Operation Manual
  • Hard Carrying Case

Click here to purchase the CD software with USB cable or contact us at sales@gainexpress.com if you want the item/s included in your purchase.

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