So far very happy with this heater. Very good price and equipment. I like that the heating element is all black and blends in with the background of my aquarium. The external temperature controller is great. The temperature set point range is 64-93F in 1 degree increments. The digital display of the external controller shows the current water temperature with 1 decimal place (xx.x F). I have them in tanks 29 and 40B, they keep the temperature very well. I will never use a hand warmer again.
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