Originally Posted by traveler of california
In what department at Walmart would I find this thermometer?
I have seen them in the Lawn and Garden and also in the Hardware section.
FWIW: I have a wired unit and since the wires where so small I ran it out the drivers door under the seal weatherstripping (between the metal and weather stripping). The overhang on our Class C worked out perfectly for a shaded spot to mount the temperature sensor.
On the inside I just used a screwdriver to tuck the wire up under the molding that runs around under the bunk. There is a small section (maybe an inch?) that is exposed, but it's not really noticeable.