I opted for the cheaper option wahrscheilich. Monsoon.
I was not disappointed. The device works perfectly.
It displays a bar chart where the different time periods can be read as days, weeks, months, and the measured values can be retrieved. So one must not write off the monthly values directly, but it can retrieve later.
There is also an alarm call for rain beginning and an exterior and interior temperature display.
I prefer a star off because the bar chart values every 7 new calls in succession repeatedly.