Our first Fischer-hygrometer with thermometer (stacked in two separate housings) is now about 30 years old and works as the first day. The only drawback: after such a long time and occasional regeneration at high humidity forming on the inside of the glass debris that can not be removed, because the glass is firmly attached - as well as the current model. We noticed it but only a few years ago - so no need to worry. To make the glass removable has presumably. even more disadvantages. In comparing the two generations the readings by 1% or 1 degree differ from one another - no better way to document quality - can at the absolute figures times overlooked. The only point that really bother us - that's why a star deduction - are the small numbers of the scale of the new device - much smaller than the old, which can be seen even without reading glasses. We do so not climate science, but look just occasionally in passing times after the "rights". Nevertheless, of course, a strong buy recommendation.
