I bought mine at Walmart after striking out at Target and Home Depot. Mine cost about $12/ea. I use two, since I have two UTH (my apartment is cold because my boyfriend is a freak - I wish the 20L was big enough for me to share it with the snake...I'm a big fan of heat and humidity, so my BP is living my dream, while I sit shivering next to his enclosure). I measure the ambient air temp on each side, and the floor temp for each UTH. My next project is to convince my former Navy ET boyfriend to mod my thermometers to get rid of the 10' of wire and add more external sensors, so I can keep the thermometers outside of the enclosure.
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