That is more interesting I had only clicked on the SQM model.
IR cloud is what you need, I guess the question is how reliable it is?
That's ~1/3 the price of pretty much anything else. These are used by places like SRO so should be decent -
https://interactiveastronomy.com/skyalertindex.html
All of them suffer the same issue which is that IR sensors invariably degrade over time and get less sensitive, so they have to be replaced some what regularly.