Mostly Vivarium Electronics and Herpstat. I prefer VE for the way they look, and I find them MUCH easier to set; I always have to get out the printed instructions with the Herpstat. Nevertheless, I did get one lemon VE early on (along with a bunch of branded VE digital thermometers that had faulty incomplete readouts from the get-go), and swore off that brand for a long time. I only tentatively tried again with VE recently. In case one goes wonky, I purchased the VE t-stat in the single port configuration (VE-200). That way, I've lost $100, rather than $200, and only one heater is down.
I have a couple of cheap HydroFarms also, but they will be replaced in the next couple of months. They don't seem to harm the mats any. Not sure if the temp variation is really a problem for the snakes or not, I have them with one of the coulbrids.
I've measured the temps the Ultratherm gets w/o a t-stat, and they get MUCH too hot (my temp gun recorded 110F+), despite what the packaging used(?) to state. In a pinch once, I did set the mat on a tile, and raised the enclosure well above it, but RISKY!!, esp. with a Sterilite tub that has a somewhat flexible bottom.
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