Product review (4 stars): Very nice, managed to change it to celsius after realizing that it was a F only device
It does look nice, and the temperature reading seems accurate. Very nice for the price.
I was looking for something to buy along with some leftover credit and came accross this, but didn't realize that it is only Fahrenheit, real bad. So be very careful with that.
There is a way to change it to celsius, but involves opening the device and removing soldering so I really not recommend it unless you made the mistake of buying this and expected Celsius temps. You open it, remove the screw, wiggle the back cover while pressing the clips that hold it, then remove the pcb after removing the 3 very small screws. On the back of the PCB there is a "J1" mark, that is where a switch could be conected, it should be shorted, remove the soldering on it and close the device carefully. Be advised that this worked on mine (bought it on april, 2015), and there is no guarantee that this would work on newer models.

-> very nice for the money, but it is only F so be careful.