Ranco are on off. The VE series have very few features compared with most of the competition in fact they are dwarfed by all but helix in features. That leaves the intro and the one. I would suggest the intro plus over the intro the mechanical relay and under temp shut down are worth the extra few dollars. The one has the added humidity control and pulse. The intro may cause buzzing due to the dimming nature of the controller so that leaves the Herpstat one. The ecozone and herpkeepers are a fair bit more they offer far advanced warning systems but fewer safety systems, they however are priced quite a lot more than the herpstat.
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