Amprobe CO2-200 [3475100] Wall-Mounted CO2 Meter. The Amprobe CO2-200 Wall-Mounted CO2 Meter is designed to measure air quality compliance in occupied spaces such as offices, production floors, schools or hospitals. The portable CO2200 features Instant feedback with CO2 levels, with additional temperature and humidity measurement. The Amprobe CO2-200 measures CO2 up to 9999ppm as well as temperature, relative humidity, dew point and wet bulb.The meter has a built in alarm warns against dangerous CO2 levels. The CO2-200 offers a super large LCD display with CO2 reasing and has a high performace low drift sensor designed with NDIR waveguide technology with auto background calibration.