Product review (4 stars): I added a blob of glue just before the wire exits the unit to keep it secure.
Changing to Fahrenheit is pretty easy - just follow the directions on the reviews, note: there are several different models so click the pic, then keep clicking the pic until the unit that matches your board is displayed.  Another thing, while I was modifying from C to F the attached sensor wire was very weak and while trying to figure a way to secure it one wire came off. Easy enough to solder it back. Then I added a blob of glue just before the wire exits the unit to keep it secure. Also if you are using this for a purpose where the wire length is too long you can easily cut and solder it back to your desired length.