I use the Vivarium Electronics and I have to say I love them. They are super easy to use and are very accurate. I also like how they are stackable. The VE200 and 300 are also proportional and mine are not only accurate, they are exceptionally consistant.
The only downside I have found is that you'd need one for each rack - or use a VE300-x2 for two racks (that one's dual zone). But if you have more than 2 racks, you could get the Herpstat 4 and operate all 4 racks on one t-stat which would be more economical in the long run. But as far as the VE t-stats go, they are a super product and I think you'd be quite happy with one...
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