Review on 🌡️ 3-Pack Blue Aquarium Thermometer with Suction Cup - Waterproof LCD Digital Fish Tank Water Thermometer with Fahrenheit Reading for Reptile Aquariums and Fish Tanks by Cristabel Logan

I have ordered several of these thermometers, with the former being the best is. Several I later ordered worked with varying degrees of accuracy. Four of them clearly had internal problems and their batteries were dead! With new batteries they only run for about 48 hours. The rest were used at the same time (we have seven tanks) and they all showed different temperatures, but a reliable temperature gauge showed that all tanks were the same temperature. I don't think we will use them again.