The Triplett Model GSM200 Desktop Indoor Air Quality CO2 Monitor simultaneously displays CO2， Temperature， Relative Humidity， Time and Date and can be used to measure air quality in office buildings， schools， exhibition halls， shopping malls， meeting rooms， fitness centers， restaurants and other public places. It has 3 status indicators (Good/Normal/Poor) that change with CO2 concentration and user programmable audible/visual CO2 alarms (Good (default 800ppm)， Poor (default 1200ppm)) with disable to alert you when safe CO2 levels have been exceeded. The sensor incorporates NDIR (non-dispersive infrared) waveguide technology and has a built-in CO2 Automatic baseline calibration for long term drift compensation. Minimum/Maximum function records the highest and lowest readings for CO2， Temperature and Humidity over time and Data Hold can freeze the reading on the display for easy viewing. Temperature readings are °F/°C selectable. 1-year warranty. Includes AC adapter.

Simultaneously displays CO2， temperature， relative humidity， time and date

3 status indicators (good/normal/poor) change with CO2 concentration

User programmable audible/visual CO2 alarms (Good (default 800ppm)， poor (default 1200ppm)) with disable

CO2 automatic baseline calibration for long term drift compensation

NDIR (non-dispersive infrared) Waveguide technology

Real time calendar with date and time

Minimum/maximum records highest and lowest readings for CO2， temperature and humidity

Data hold freezes the reading on the display

°F/°C selectable