In my old rack I attached my thermometer probes to the tubs by putting a small hole near the rear corner and putting the probe through, then putting two small holes next to that and using the smallest loop tie, secure the cord so that the probe is flat on the bottom.

I have found this works well, and the snakes do not move it around as it is tied down securely. However, it is a pain in the butt when I want to give the tubs a thorough cleaning (i.e. run in under a tap or shower) with the probe permanently attached and trying to make sure water doesn't go to the thermometer body.

Now I am building a new rack, almost done. I have bought thermometers but am unsure what is the best way to attach it so that it is secure, yet removable. I hear hot glue but I don't see how that is easily removable because you would have to melt the glue or rip it off which would leave the glue residue on the probe/cord, and reattach with more hot glue.

What is a good way to non permanently but securely fasten a probe to the inside of a tub? Pics appreciated.