Radiation shield or sun shield for Mijia thermometer.
I was using this thermometer for about 1,5years outside (-10°C to 45°C) under simple PLA 3d-printed roof and it worked well (despite that it should be indoor one.)
The roof was trapping heat, so I made adjustments to this radiation shield to use it with this thermometer. Here is a comparison on spring cloudy day:
How to use
Slide thermometer to the holder
Plug holder into the shield (the thermometer is held side-to-side by the hole diameter)
Secure the holder by ziptie or 2mm x 10 screw to plastic
Secure the whole thing with zipties to your location, in my case - balcony guardrail.