Bacharach Comfort Chek 400 Portable Air Quality Monitor - DISCONTINUED


Key Features:

This Product is DISCONTINUED

  • Simultaneously displays CO2, temperature and relative humidity for easily assessing indoor air quality
  • Selectable CO2 alarm level plus display options for CO2 and temperature
  • All kits include hard carrying case for safe storage and transportation
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Bacharach’s Comfort Chek 400 Portable Air Quality Monitor, is equipped for the measurement of CO2, relative humidity and temperature.

The Comfort Chek 400 features a vast backlit LCD which display all three parameters at the same time. More still, Bacharach has outfitted the Comfort Chek 400 with a list of advanced features and functions like selectable MIN/MAX/STEL/TWA values for CO2, air/dew point/wet bulb values for temperature and a CO2 level alarm. The device is powered by 2 AA batteries or the included wall adapter for unceasing use.

Supplied with a durable, hard-shell carry case, the Comfort Chek 400 is the ideal tool for monitoring air quality in offices, school, hotels and a list of other critical locations.



  Temperature (ambient)

  Relative humidity


0 to 5000ppm

14 to 140 °F (-10 to 60 °C)

0 to 99.9% (non-condensing)


LCD with backlight, shows all 3 readings simultaneously


4x AA batteries or via included wall adapter

Run Time

20 to 24 hours typical, using alkaline batteries (continuous using wall adapter)

Size (H x W x D)

6.6 x 2.8 x 1.3 in. (16.8 x 7.1 x 3.3 cm)


7.1 oz. (200 g) including batteries

Operating Conditions

32 to 122 °F (0 to 50 °C), 0 to 95% RH (non-condensing), 1 ATM ± 10%

Warm-up Time

30 seconds


CE mark


2 years

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