A weird dream about the thermometer

 I had a dream about the mis-calibrated thermometer. In it, I took the battery out and it worked again so I had a go.

I'm glad I did because I found some interesting stuff inside. The display is powered from the metal contacts at the top of the green board through the bendy piece that looks like a licorice all-sort - the pink thing with the black middle. It is flexible and slightly compressible so it makes good contact and I'm assuming that the black middle must be a conductor. When I put it all back together, itm was working correctly again - but a day later it went back to its old ways! Oh well...