Designed to fit a temperature meter currently available for approximately €1 (at the time of writing):
https://amzn.to/3DBIQpf
 

Recommended Print Settings:

• Walls: 4 layers

• Infill: 10%

• Brim: 10mm (out- & inside)

• Supports:

• Painted support in the ring

• Type: Organic

Compatible With (as per Amazon description):

Indoor & Outdoor Temperature Humidity Meter – Indoor Temperature Sensor Hygrometer | Round Digital Humidity Gauge