Transmitter model GMW83A has indicator LEDs for the measured CO2 level on the front cover. The LEDs provide a visual indication of the measured CO2 level to the occupant of the monitored space.
The LEDs are lit as follows:
- Red LED (top): lit between 1200 ... 2000 ppm CO2, blinking > 2000 ppm CO2.
- Yellow LED (center): lit between 800 ... 1200 ppm CO2.
- Green LED (bottom): lit between 0 ... 800 ppm CO2.