TFA Dostmann Comfort Control 30.5011

What it measures, and what it doesn’t

A straightforward digital reading of indoor temperature and relative humidity, with a stated mould-risk alarm that flags when conditions sit in a range associated with mould growth. It doesn’t measure CO2 or particulates — for that, this network’s air-quality monitors are the relevant category.

Why an independent reading matters

Every humidifier and dehumidifier reviewed in this network reports its own onboard humidity reading, and those readings don’t always agree with each other or with reality — sensor placement, calibration drift and airflow around the unit all skew the number an appliance shows. A separate, cheap instrument placed elsewhere in the room gives a second opinion that isn’t affected by sitting directly in a humidifier’s mist stream.

Confirmed across three markets, at a similar price

We found this specific TFA Dostmann model — the Comfort Control 30.5011 — listed with double-digit active sellers on Germany, France and Italy, at broadly consistent prices between roughly 25 € and 28 €. That’s a notably deeper market than several other accessories in this network, where we’ve often found only a single confirmed seller. We didn’t find a confirmed listing on Amazon.es at the time of checking.