I own one and it is so inconsistent that it is 100% useless the day to day accuracy is unacceptable (mine varies 9º AVERAGE daily temp) I cut the probe off as it was so bad I could not in good faith sell it.
Look at it this way your rack houses 4-10 animals? More ? a good thermostat is 100$ so 25$-10$ per animal. One that offers piece of mind and accuracy with high AND LOW shut offs is a bit more but not much say 30-12$ each. A rack is a professional tool buy a professional thermostat for it, this is a small expense compared to heating the room and feeding the snakes.
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