Product review (4 stars): Be advised it is in degrees C only. I ...
Be advised it is in degrees C only. I did try to change it to Degrees F per one of the posted suggestions, but the circuit board looked different than in the posted photo. So I put it back together and will just convert C to F for  my use which will be for a freezer monitor. 0F will be -18C. I suggest not taking it apart as I had to fumble with it some to get it back in working order. It seems sensitive enough and look forward to trying it out in the freezer application.