This does exactly what they say. Really accurate and keeps the temperature very well. The digital reader is excellent. The previous heater I had was analog and of course it failed and I didn't realize it was no longer holding the temperature. The heater was still on, but the water was freezing. The only thing I would change is the way you hang it on the tank. Maybe it should have a strong suction cup or some way to attach it to the glass of the tank. At the moment it just hangs there and can swing back and forth.
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