Posted in | Gas Sensors

CM-504: CO2 and CO Handheld Gas Detector

With the ability to log data for later analysis, the Carbon Dioxide and Carbon Monoxide Handheld Gas Detector measures CO and CO2 concentrations in real time.

The user can measure ambient gas levels using data that is displayed and gain indication through visual and audible alarm settings with long-term data storage.

CM-504: CO2 and CO Handheld Gas Detector

Image Credit: CO2Meter


  • NDIR/EC technology to measure CO2 and CO concentrations
  • CO2, CO, PM2.5, PM10, Temp, R/H%, and Baro
  • Large LCD for easy readability
  • Audible Alarm
  • Data Logging with 16 GB SD Card
  • Li-ion rechargeable batteries included

About CO2 Storage Safety Codes

According to the NBIC, NFPA, or IFC regulations, a fixed/wall-mounted, hard-wired alarm is necessary for CO2 safety monitoring, and this device does not meet those requirements.


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


  • Dimensions: 204.5×91.7×49.6 mm (8.1×3.6×2 inch)
  • Measures: CO2, CO, PM2.5, PM10, temperature, %R/H, and Baro
  • CO2 Measurement range: 0~9999 ppm
  • Sensing method: NDIR and EC
  • CO Measurement range: 0~1,000 ppm
  • PM2.5,10 Measurement range: 999 ug/m3
  • Temperature: 0~50 °C, ±1 ℃
  • Battery Life: Tested to 24+ hours
  • Power Supply: 3 Rechargeable Batteries - Li-ion 18650 3.7 V
  • CO2 Accuracy: ± 50 ppm, ± 5% of reading (0~5,000 ppm)
  • CO Accuracy: ±5%~±10%
  • Weight: 305 g (without batteries)
  • PM2.5,10 Accuracy: ±15% or ±15 μg/m³ (whichever is greater)
  • Life Span: NDIR: >15 years, EC < 1 year


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


Data logs are stored on a micro SD card by this device. This device is incompatible with the GasLab® Software.


  • BAT-18650 - EBL 18650 3.7 V Li-ion Rechargeable Batteries
    • All CM-500 series handheld gas detectors can be used with EBL Intelligent Batteries, which offer fast charging and are upgraded ETL certified (the device requires three)
  • EBL Universal Battery Charger for 3.7 V Rechargeable Batteries
    • Users can charge lithium batteries with the EBL Universal Battery Charger when plugged into a USB outlet. Additionally, the battery charger shows the charge levels clearly by turning green when the battery is fully charged.

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