Want to make your stick-on therm last longer?
DO NOT PEEL OFF THE STRIP IN THE BACK!!
Instead use some "scotch" tape across it to stick it on temporarily.
This way you can remove it when washing/submerging in water. I find the repeated washing and "tub baths" to keep the temp down seperates the plastic overlay from the actual therm strip.
For tub baths I have my carboy in a milk crate (usual practice anyway) while in the tub/bin and hang my needle therm/temp gage from the crate.