JW Aquarium SmartTemp Thermometer

I received this thermometer today and placed in my aquarium right away to test if it does in fact stay down as the description says, you’ll be glad to know that it does stay down.The fins you see at the bottom serve as an anchor, the fins have weight and are shaped to help the thermometer stay in place, but be sure to gently push the fins into the sand or gravel.I have a wave maker in my tank that creates currents from two different directions every 2.5 minutes, the thermometer did not move once and hasn’t since I placed it in the gravel.The thermometer has both readings in Celsius and Fahrenheit on a white background with a “green safe zone” area in the middle. Reading temperatures is very easy, the visibility on the thermometer is very clear.As for accuracy, I can say with confidence that the water temperature is displayed with minimal margin of error, if any, probably or – .2 degrees. I have a digital thermometer with a probe and both displayed the same temperature.The overall construction of the thermometer is of very good quality and materials, the housing is made of glass and the fins of plastic, not sure what they used to give weight to the fins, but it works, it does sink and stays sunken.Nowadays is hard to find good aquarium thermometers, they are either inaccurate or brake easily, this one however, even though is made in China, seems to be well built and I expect it to last. Hope this helps.