As far as I know they both function the same, just the pro has a few more features and 4 probes. How many snakes do you have or plan to have? If you only have one or 2 then you only need a herpstat or herpstat II.
"Nonproportional Mode (Heating)
Heat is applied until the temperature exceeds 88.5°F.
Temperature is allowed to drop to 88.0°F before heat is reapplied. This floating method avoids
unnecessary wear on the heating system."
I think this is just saying that it doesn't allow it to get too hot or too cold, it maintains a fairly close temp to not have so much expansion and contraction on the elements of a heating pad, but with this mod it's fairly useless if you buy this t-stat. Not many people buy this to use it as an on/off style.
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