Review on 🌡️ Fluval EDGE Digital Aquarium Thermometer: Measure Aquarium Temperature with Precision (64-86°F) by Kimberlee Winn

Works as expected and gives a good indication of the water temperature in the aquarium. Green indicates the temperature reached, and when brown and blue are displayed, the temperature is between these ranges. Seems accurate enough compared to a handheld digital thermometer, but since there is a large gap between the temperatures listed, it is more of an estimate so you can determine if your tank's water is a good OVERALL temperature for a fish or aquatic creature. They keep in the tank. I like that it's small and doesn't take up much space and doesn't obstruct the viewing surface of the tank. Place it somewhere below the water level (I attached mine to the bottom corner of the tank). I use them for my battle tanks :)