Bracket for electronic rain gauge, as available at aliexpress, etc. for weather stations (MS-WH-SP-RG). It's designed for a pole diameter of 37.5 mm.
Now that I know how the rain gauge works, I would prefer to print the rain gauge myself. It costs about 18 EUR in China, which seems expensive to me. It consists only of plastic and a reed sensor.
Feel free to remix my Tinkercad-model:
https://www.tinkercad.com/things/4ghyB8XuKXH
https://www.tinkercad.com/things/0zaOMrOmrhH
Category: Electronics
The author marked this model as their own original creation. Imported from Thingiverse.