Product review (2 stars): It is quite small, with ridiculous and poorly worded ...
It is quite small, with ridiculous and poorly worded instructions.  It appears you cannot change from Celsious to Fahrenheit.  The unit does not have anyway to attach it to the inside of refridgerator, I guess you could put some two sided tape on it to stick to wall, but the moisture inside fridge may prevent that from sticking to walls and unit.