I have to look which models I have at home. They may not be exactly "proportional", but the 0-10 V thing sounds familiar. I use them with Ultratherm heat mats and flexwatt, I set it to 90 degrees F, set the differential (what it can drop to before kicking back on) and thats it. The heat pad tests with an IR heat gun to exactly 90 degrees. Is that proportional, I am not truley sure? My Big Apple thermostats seem to fit the proportional description much better but are far less acurate as the Rancos. Now that I think of it, which one is really better? Either way both are upgrades from the crappy ESU on/off model I am using on my Incubator.



-TT
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