I use velcro to hold up the digital thermometers in my tubs so I can read them. If the snakes knock them down, just the velcro comes apart and the sticky part stays on just fine. I have however used duct tape and would definitely advise you NOT to use it. When I first got my snakes I used some duct tape to hold up the thermometers instead of the velcro, well needless to say snake + tape = bad experience.