The temperature now show all devices of the same. Only the humidity is at each other.
My new devices show 49 to 52% and are in the tolerance also specified by the manufacturer.
Unfortunately interpret my "older" digital hygrometer to a moist 44-45%.
According to the description they are aligned at the factory, but long dry storage and / or a rough shipping to change the setting.
Thus I have the new leave as directed in the instructions enclosed regeneration (for 1/2 hour to wrap in a wet towel).
After half an hour should appear 95-98%. For me, however, the pointer went on the scale to approximately 100-105% humidity.
Using a small screwdriver but you can re-adjust well on the back. What had made somewhat more difficult because of lying a bit deeper in the housing small screw and the harsh view of this as yet but is expected to create no problems.
After that I again waited half an hour wrapped in towel equipment.
Again, the pointer went on the scale. After a further adjustment I let one day air-conditioning next to each other.
Now the hoped-for effect ceased and all run synchronously to 1-2% deviation.
Conclusion: Good hygrometer with some home Readjustment necessary.