I use two Herpstat 4 and have a probe on every level. It's expensive but I like that I can control every single level individually, so I can have one level of breeders and customize their temps. I also have separate temp alarms on each level, so if one Herpstat gets unplugged I will still have a high and low temp alarm. I have too much invested to take any chances. I found that there's too much variability between levels with just using one temp probe for the whole rack.
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