The Aranet4 CO2 monitor is a battery-powered CO2 device suitable for monitoring the CO2 level at home, at the office or in any other indoor environment. Data is displayed in real-time on a power-efficient e-ink screen. You can also view or download a graph of the readings by connecting the device to your Bluetooth-enabled phone or tablet (details below). It is often more useful to observe trends over time than a single value as room air fluctuates over time.

You can check the Quick Start Guide for information on healthy CO2 levels and the ranges to be aware of. Reminder: These devices are not carbon monoxide detectors and are not life safety devices.

Tips for the most accurate reading

• Take the device outdoors in an open area away from crowds. After a few minutes the reading should be between 400-450 ppm, that means it’s properly calibrated.

• If the device is not properly calibrated, follow the instructions in the User Manual.

• Always take readings at least 2m away from people’s faces or your readings may be artificially high.

• Readings should be performed when the space is occupied. If you expect 30 people in the room, you’ll want to take a reading with 30 people present.

• You may notice the readings stay steady, rise continuously, or cycle from higher to lower values. These patterns provide hints to how the space is ventilated and may guide your troubleshooting to improve ventilation in the space.

Connecting to the Aranet4 app

If you want to view or download trend data, connect the device to your mobile device. 

• Download the Aranet4 app from the Apple store or Google Play store - Bluetooth must be enabled.

• Tap Pair New Device.

• Select the device and enter the code on the front of the device.

  
  

• Your device will now begin reading the air quality.

Ready to get started?