Frankly, I wouldn't take that tech's word for gospel, especially since the implication is decidedly not user friendly. Scroll down to 'Water world' in
this MacWorld article to get an idea about the why of my take on things. At the very least we may expect to get some hard data on the responsivity and reliability of the much maligned moisture sensors.
As to the temperature range a device can be used, it's questionable whether subsequent effects like condensation played a role in establishing those. You don't want to compound things in tests like these. For instance, it's quite conceivable that the test devices were packed in a dry atmosphere inside a waterproof package.
