Review on IOAOI 50W Aquarium Heater for up to 20 Gallon Tanks - Shatterproof, Suitable for Marine and Fresh Water - Engineering Plastic Tube & Stainless Steel Inside - Adjustable Temperature by Amanda Thomas

I've had this heater for 4 months now and it's mostly good. It seems to me that it doesn't heat up above 82, which is normal as I only need 78-80 degrees. The scale does not correspond to the actual temperature. For example, I need to set my watchface to "84" (the maximum value is "88") so that it reaches a temperature of around 78-80. But it heats up nicely if I set it up properly. Another thing is that it is difficult to lower the temperature by a few degrees. I adjust the dial a bit and it drops a few degrees lower than I expected so I have to keep a close eye on it. Despite these issues it works and in some ways is safer than other heaters on the market and looks beautiful. Good price. I can easily ignore minor annoyances.