When I bought an Engel fridge we got a heap of gear with it. Amongst the goodies was a clock thermometer unit. It comprised of a sender unit that goes in the fridge and the clock/ thermometer part that goes on the table or wall.
It came with batteries and between the battery and the connection in both the sender and the reciever was a small piece of plastic that you removed so it gets voltage.
I got the book to set it up and nothing would work as it was supposed to. I pulled all the batteries out checked them,replaced them tried them in a torch and put them back as stated but still no go. Hit the reset and the figures gave a slight flick but that was all.
By this stage I was starting to get a bit pissed off. So I removed the batteries and waited 3 hours and put them back in the order as stated but still no good.
Any way I was going to take it back then I had a real close look at the face.
Over the face there was a piece of plastic film with the digital 8888 printed on it for the time, ambient temp, and fridge temp.
Pulled the plastic face cover off and guess what ….the real digital display works like a champion.
Didn’t I feel stupid…………..but not as stupid if I'd actually taken it back :-)