Herpstat is by far the best brand on the market. To my knowledge, they are still currently the only tstat that has a safety feature which shuts the unit down in the event of failure. Even the next best product (the vivarium electronics I believe) can and will fail in the on position if it breaks, skyrocketing your temps and potentially harming your animals, damaging you equipment or even stating a fire.
Totally drop the cash on a Herpstat if you can afford it.
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