I can say that my EZ Reader and my partners K2 work fine in 32C temps in full sun at around 70% humidity with no 'blur' or fuzzyness.....
These are the normal condtions in my part of the world, often going to 34C +.
A bit of glare on the screen from the sun is my only issue with either device.
It would be my opinion that the screen quality appears to change on a batch-by-batch basis, but I can report no problem with either the K2 or the EZ reader.....
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