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It's one of these:
https://amzn.eu/d/1hwjXYnQuality is decent as you'd expect for a German company and it works well, although isn't totally oblivious to direct hot sun (I think you'd need a much bigger one for that).
I got it from Amazon Warehouse which looks like it's still an option and was a lot cheaper.
Which Stevenson screen do you have?
I've just bought a cheap Chinese 'solar radiation shield' from Aliexpress to house my heat pump's external temp sensor and mitigate solar gain, but it cost £5 and likely of dubious quality...