Quote:
Originally Posted by meeera
Just to reinforce what others have said - a waterproof reader might be fine in humidity, but if you choose to exceed the manual's recommendations on operating temperature, you're on your own.
H2O : "Avoid storing your device in temperatures lower than -10° and higher than 60° C (14° to 140° F). Operation of the device should occur in temperatures between 0° and 45° C (32° to 113° F). Dramatic changes in temperature or humidity may affect the functioning of the device due to the formation of condensation."
(addit: really dramatic temperature changes may also crack the substrate.)
Nook Glowlight Plus: "Use in moist environments with extreme temperatures, such as a hot shower or steam room, is not recommended."
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A sauna is a pretty hostile environment for electronics. I certainly wouldn't use a reader in such a place, waterproof or not.
Heat alone doesn't tend to be a problem - I regularly use my Kindle in Egypt in temperatures of 40C+. It's the combination of heat and extreme humidity that's the killer.