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Here are the B&N ranges for temperature for the nook:
Charging
41– 95 ºF
5 – 35 ºC
Operation
32 – 104 ºF
0 – 40 ºC
Storage
5 – 113 ºF
-15 – 45 ºC
If your sauna is hotter than 104, I wouldn't use the nook in there, it might develop issues. I get nervous just toting my nook around to wait for the bus, if it's colder than freezing out.
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