Review on Aquarium Submersible Temperature Intelligent Controller by Christina Wilcox

I've had several different heaters and this one is a tenth different than my thermometer than the temperature on the switch. So far, so good! Easy to use and fits in small spaces. I have a 9 gallon Fluval spec with my Betta Finley and have been constantly concerned about the water temperature. The previous heater I had was a whopping 50 watts, but the temperature difference was 2 to 4 points the entire time. This heater is great. I will update if necessary.