Suction cup issues

[Craiga 01453]

It's not that it should be there, it's an option. It can also be inside.

You can use a little hot glue to hold it in place (or epoxy or something similar) or a zip tie onto the edge of something in the terrarium. Lots of options.

Fair enough. However, hot glue can break down over time, the probe can be laid on, peed on, etc...which can all cause inaccurate readings which can result in dangerous heat spikes.
Being sandwiched between the UTH and the glass it stays put and provides consistent readings