Proportional thermostats like herpstats and helixes are the nicest, but on/off t'stats (Johnsons, Ranco, Hydrofarm, VE's, etc) do the job just fine and don't cost quite as much. I personally use Johnsons and Hydrofarms. Thus far I haven't had any issues with the Hydrofarms, but they're rather cheap, and I wouldn't trust them to run with anything potentially hotter than a standard heat mat. I use Johnsons to control all my cages with flexwatt.
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