We recommend using professional testo devices for measuring and documenting humidity, as we have found significant deviations in many commercially available hygrometers – which generally means that data recording is not possible. We have provided details on the important topic of humidity in our Blog posts The 'testo 174 H – mini data logger for temperature and humidity' (RRP, as of 2025: approx. EUR 118.00) is, in our experience, very well suited for this purpose. You can find details about these products on the manufacturer's website, where you can also purchase them.
