The AQM-102 is designed to measure CO2 concentration, air temperature and relative humidity with visible and audible alarms. This CO2 monitor is an ideal instrument for indoor air quality (IAQ) diagnosis and HVAC system performance verification. Six (6) Smiley Icons Indicate Indoor Air Quality Levels at (350/450/700/1000/2500/5000 ppm) Stable Ndir Sensor for CO2 Detection Manual 400 ppm Calibration
