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Carbon Dioxide (CO2), Carbon Monoxide (CO) and Oxygen (O2) Handheld Detector

Carbon Dioxide (CO2), Carbon Monoxide (CO) and Oxygen (O2) Handheld Detector - CO2 Meter
Regular price $799.00

POs or wholesale quantity discounts click here

The CO2, CO, and O2 Portable Detector is designed to measure carbon dioxide, carbon monoxide, Oxygen, relative humidity and temperature across a variety of applications. With long-term data storage, the user can measure ambient gas levels by data displayed and gain indication by visual and audible alarm settings.


  • NDIR (CO2), EC (CO), and Fluorescence quenching by Oxygen (O2)
  • Measures RH% and Temperature
  • Large LCD display for easy readability 
  • Audible Alarm
  • Data Logging with 16 GB SD Card
  • LCD Backlight for easy readability by dark
  • Li-ion rechargeable batteries included


This device will NOT meet requirements for CO2 safety monitoring which requires a Fixed/Wall mounted, hard-wired alarm per the NBIC, NFPA, or IFC regulations. Refer to our CO2 Safety Products page for devices that meet your needs.

Call us at (877) 678-4259 toll-free or email us to speak with our technical sales team about purchasing the correct device.


  • Food and Beverage
  • Brewing
  • Agriculture
  • Poultry
  • Cryogenics
  • Scientific
  • Medical
  • Safety, and many others


    • Measures: CO2, CO, O2, PM2.5, PM10, Temp, RH%
    • Sensing method: NDIR, EC, and Fluorescence quenching by Oxygen
    • CO2 Measurement range: 0~9999 ppm 
    • CO Measurement range: 0~1,000 ppm
    • O2 Measurement range: 0~25% 
    • Temperature: 0~50°C
    • PM2.5,10 Measurement Range: 999 ug/m3 (whichever is greater)
    • CO2 Accuracy: ± 50ppm, ± 5% of reading (0~5,000 ppm)
    • CO Accuracy: ±5%~±10%
    • O2 Accuracy: <2% FS/0.1 mbar
    • PM2.5,10 Accuracy: ±15% or ±15 μg/m³
    • RH Accuracy: 0-100%
    • Power Supply: 3 Rechargeable Batteries - Li-ion 18650 3.7V 
    • Battery Life: tested to 24+ hours
    • Weight: 305g (without batteries)
    • Dimensions: 204.5 x 91.7 x 49.6 mm (8.1 x 3.6 x 2 inch)
    • Lifespan:
      • Fluorescence Quenching by Oxygen: 5 years
      • NDIR: 15 years
      • EC: 2 years


    • CO2, CO, O2, PM2.5, PM10 Gas Detector
    • Manual
    • USB Charging Cable
    • SD Card (16g), Data Logging Capability
    • Three (3) Li-ion rechargeable batteries


    Software Options

    This device features data logs that are stored to a micro SD Card. The GasLab® Software is not compatible with this device


    EBL Intelligent Batteries (need 3 for device) provides a fast charge and are upgraded ETL certified to be used with all CM-500 series handheld gas detectors.
    With the EBL Universal Battery Charger, users will be able to charge the lithium batteries when plugged into a USB outlet. The battery charger also provides a clear indication of charge levels, turning green after fully charged.

    RS485 Cable Option - Contact Us for Further Information

    System Requirements for Data Logging or Changing Defaults

    • Windows XP SP2 or newer
    • Microsoft .Net 3.5 Runtime Libraries
    CM505 Handheld CO2 CO O2 Gas Detector
    • Data Sheets

    • Manuals

    • Technical Documents

    • Videos

    • Additional Resources

    • Case Studies

    Customer Reviews

    Based on 2 reviews
    Kelly Golden
    What a relief!!!

    Easy to use and it is a great relief to know we are able to getting accurate readings in real time


    Great and fast service

    "Easy to install, easy to set up, and easy calibration - just what I was looking for."

    - Phillip Farrar
    Water Plant Superintendent

    Read More Reviews...