
Calibration (only for the first time use):
1. Press and hold the On/Off button for a few seconds.
2. Device will start up.
3. The screen will display 120-second countdown.
4. Keep the product in outdoor fresh air for 120 seconds.
5. Press and hold the On/Off button until the green light is flashing.
1. Press and hold the On/Off button for a few seconds.
2. Device will start up.
3. The screen will display 200-second countdown.
1. After 200-second countdown, results will display on screen.
2. Indicator lights will turn on.
3. Press the On/Off button to turn on/off the backlight.
1. Press and hold the On/Off button for a few seconds.
Indicator lights definition:
1. Green light: good air quality.
2. Yellow light: gas concentration is out of limits, ventilation is needed.
3. Red light: gas concentration is severely out of limits, a comprehensive
indoor air clean up is recommended.
4. Red light twinkling: gas concentration is out of detection range,
please vacate the premises immediately.