Of the four hygrometers of three different types I ordered from Thomann, this one gets the closest to actual relative humidity @ within 1%, which is excellent for any hygro let alone one at this very reasonable price.
Great that it records and saves maximum and minimum values and calculates dew point and wet bulb temperature as well as allowing high and low alarms to be set on any of the measuring parameters.
I think all these TFA hygrometers are reliable once you have an accurate RH reference point and I recommend this one to achieve that.