With me being a 15 year old with no job, I got my mum to buy the thermometers Lol. But I'll be 16 in a month and a half so hopefully I'll be able to fully provide for my snakes with my own money- which will be nice.
Actually, for my small hatcling tank I have a T-Rex dial thermometer on the glass. I'm sure it doesn't work because wherever I put it in the house, it stays at almost exactly the same temp. Hmmm. Maybe I'll make my mum take it to London with her tomorrow to see if it works because it's supposed to be a massive 35 degrees (95F).