I second the recommendation for luggage straps- I have a pair of these https://www.amazon.com/gp/aw/d/B0193...0,140,180_QL70 and I like them a lot, no problems so far.
A word on thermometers- an infrared "laser gun" thermometer is good for checking the surface temperature of things in your tub, but that's different than the ambient temperature of the air- I recommend the Accu-rite in addition because it'll give you a constant read on what the air temperatures are on both ends of the tank, as well as humidity.
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