The consumer magazine Vergleich.org has tested hygrometers in June 2015. Winner of the test became the FISCHER 111.01T Real-hair hygrometer with thermometer:
“The best hygrometer for domestic use in our hygrometers comparison was made by FISCHER. Its measurement was very precise and easy to read.”
For measurement outside as well as in areas with high humidity, real-hair hygrometers should be prefered. The specially treated human hair, that is used for the Fischer real-hair hygrometer 111.01T is temperature resistant (for a range of -35 till +65 °C) and reacts fast to changes of humidity.
•Measuring ranges: 10 bis 100 % r.F. | -25 bis +45 °C
•Accuracy: ± 3 % r.F. (20…100 % r.F.) | ± 2 K
•Graduation: 1 % r.F. | 1 °C
Housing stainless steel, diameter: 103 mm.