The UTH is a thin heating element (wire) encased in a pouch that can stick to a surface. This 'technology' has been used for a long, long time. Added on a $10 lamp dimmer and it's kept steady temp so far (admittedly I've only been at it for a month).
Just got this gauge from Home Hardware (probably any major hardware chain will have their own) and am quite happy with it. Has a probe so you can see both room temp and enclosure temp + humidity and can show highs and lows over the past day or week.
http://www.homehardware.ca/en/rec/in...95?Ntt=4470395
My recommendation if you're going to be buying from PetSmart is to first sign up for PetPerks, so you can get some discounts on your purchases.
https://www.petperks.com/
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