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I have an „older“ model of the outdoor module without the CO2 measurement (from June '23, the one with two PM2 modules) is it possible to upgrade it easily? I think mine also has a slot for a TVOC/NOx sensor but as far as I remember the sensor available on the store was not compatible due to size. Has that changed?

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Yes it's easy to upgrade. You can purchase the CO2 module in our online shop under the spare parts section.

The CO2 module will go into one of the PM slots. So you will have a spare PM sensor.

Feel free to also contact me through our web site support form if you have special questions on the upgrade.

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