The Comfort Chek® 400 is Bacharach’s new low cost and easy-to-use indoor air quality (IAQ) monitor designed with three sensors to simultaneously measure and record temperature, relative humidity and carbon dioxide (CO2) levels in the air. The large LCD displays all three sensor readings as well as battery status and is backlit for easy readability in dark environments. The Comfort Chek® 400 operates up to 24 hours with alkaline batteries, or the supplied wall adapter is ideal for around the clock air quality monitoring in office environments, schools, hotels or other public buildings.
Features & Benefits:
• Light weight, handheld monitor
• Simultaneously measure and display CO2, temperature and RH
• User selection for display of air, wet bulb or dew point temperature
• Audible alarm for CO2 readings
• Large, high resolution LCD display with bright backlight
• Automatically calculate and displays MIN, MAX, STEL and TWA values for CO2
• Quick and easy calibration for CO2 and RH | 
