CO2 Monitor with Relay

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Continuously displays carbon dioxide, temperature and relative humidity levels so you can monitor the quality of air in your home, office, or factory.

Just plug it in and the cSense turns on instantly, self-calibrates ans starts showing measurements. In addition to monitoring levels, the unit has both a user-configurable 80dB alarm and a relay output. The normally-open relay closes when CO2 reaches the pre-set low level to turn on a CO2 generator or similar devices.


  • Sensitive & accurate: information you can act on
  • Self-calibrating: no need to send the monitor in for re-calibration
  • Manual calibration important for gardening with supplemental CO2
  • No moving parts: nothing to break or wear out
  • Does not lose accuracy in heat or cold
  • No over-exposure or negative memory effects


  • Ranges:
    • CO2: 0 to 9,999 ppm
    • Temperature: 14°F to 140°F (-10°C to 60°C)
    • Humidity: 0.1% to 99.9% RH
  • Accuracy:
    • CO2: ± 50ppm ±5% reading value
    • Temperature: ±0.9°F (±0.6°C)
    • Humidity: ±5% RH
  • Dimensions: 130 x 85 x 60 mm
  • Weight: 7.05 oz (200g)
  • Includes 110/220 VAC Wall Adapter, User's Manual
  • 1 year warranty
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