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Title: One worked, one didn't..
Review: I bought two of these - one that turns on a fountain to keep a small pond from freezing, and another to regulate a heater to keep a small greenhouse temperature above freezing. Well, the first one works just fine for my purposes; it turns on around 36 degrees or so and turns off when the temperature outside gets to about 40, but the second is unusable for keeping the greenhouse in the 40 degree area. It won't turn on until it's about 32 and shuts off before it gets to 40. I was expecting a little margin of error (the literature says on at 38, off at 50), but not this much. So neither one really operates as advertised.
