Product review (3 stars): Don't even think about going outside with this!
I am an orange grower.  I bought several of these, some for monitoring temperatures inside a refrigerator, but others to place in various locations on the farm to monitor and store temperatures.  The inside applications did fine, but every single one of the data loggers I placed in protected locations OUTSIDE went crazy in a couple days (continued logging, but temperatures that would not be of this world...).  These devices are extremely sensitive to environmental conditions, e.g. condensation even...  They are inside only devices!  The product description describes using them in offices, warehouses, etc - doesn't proscribe from outside use, but they should - they have no environmental hardening at all, unlike some of the other data loggers on amazon that are at least hardened for condensation.....